Another "Sender Address Invalid"

I have a few email contacts that intermittently will not send and some just will not send. And some take a variable amount of time to send, from a couple hours to a few days. Then they just magically take off. Often I hear them go in the middle of the night. In all cases it's way too late for my clients to receive.
Here's my home office set up: Comcast cable with wifi setup. All mac networked and an AT&T tower less then a mile away in direct sight of my office window. All my email accounts are POP.
Everything was working fine for about 6 months. Never missed sending or receiving an email on the iPhone except an occasional delay when traveling which is understandable. Mail has always worked fine on all our Macs. I've also tried turning off the wifi on the phone and just sending through At&t still no go.
Going back and checking the settings in the mac mail prefs compared to instructions on comcasts site, they did change the port from 25 to 587 although all our macs were still working fine on port 25. I still don't use SSL, comcast didn't mention check it so I kept it unchecked. I did change the port to 587 and it too works fine on the macs but...I deleted all my mail accounts on the iPhone then resynced all mail accounts with iTunes and checked replace mail info on the iPhone. Went into the iPhone mail settings and all the new info transfered correctly but....
Still the same problem with the same troubled accounts.

If you have a wireless network at home that your iPhone is connected to for internet access, it doesn't matter where the nearest AT&T tower is located in regards to recieving and sending mail or for internet access.
Comcast does not have an authenticated SMTP server - the ISPs that provide an authenticated SMTP server are few and far between. This is why you can't send messages with a Comcast email account when connected to the internet via AT&T's cellular network, but you shouldn't have problems sending with a Comcast email account when connected to the internet with Comcast - such as when connected to your wireless network at home with Comcast being used as the ISP for the internet connection.
Have you tried deleting and manually creating the account or accounts on your iPhone instead of transferring the account settings from your Mac via the iTunes sync process?

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Getting error "Sender address invalid"

I've had the phone since release and everything has been working smoothly (and I am happy our area finally got the 3G network!), until I got a new email address.
I can receive my email fine on the phone, but when I go to reply and hit send, it tells me "Sender Address Invalid."
Does anyone know how to resolve this? Or because of my domain name, which is a Qwest email address (ends in @q.com) does Apple not like this?
Any help would be great. Thanks!

My 3G started this "invalid" stuff over Christmas. Thanks for the comments on how to fix. FYI, I had to take an extra step because my email address is [email protected]
The delete restart account did not work...I tried several times. Then I entered my email address as [email protected] It still didn't work, but put me into what looked like the old iPhone pop3 setup screen. I then changed the two [email protected] addresses to [email protected] and it works fine.

Sender Address Invalid

New Iphone 3G bought this week.
Set it up with my Cablevision acount ([email protected]).
I can receive and read e-mails on the phone no problem whatsoever.
When I go to send them, I get a "Sender Address Invalid" option and then they just remain in the outbox.
Any ideas? I know there's the disclaimer that Cablevision mail only works with certain connectivity (edge? 3G? Not sure).
Any advice or tips?

haha, yeah!! WHAT is is the answer. This is the exact issue I have!

Cannot send e-mail - "The sender address invalid" error message

Today I keep getting this error message "The sender address is invalid - when i try to send e-mail. I checked my settings and they are the same as always - my e-mail address hasn't changed; the outgoing and incoming server information is the same. I went through the Troubleshooting steps and still nothing. Also it's taking a really long time to connect to check for incoming e-mails. Any clues on why this is happening or what I should try next? The e-mail is via Roadrunner does that matter (althoug it didn't a couple of days ago)

This message means that your outgoing email server is not letting you connect to send email. Maybe RR changed their policy. You should be able to send using home WiFi, but when using 3G RR will not allow connections from outside their network.
One easy way around this, is to use the built-in AT&T SMTP server for outgoing email.
Or, check the RR FAQs and see if they allow an authenticated account to send email - maybe you just need to add SSL and username/pwd on the RR outgoing email server settings.
BTW - this is asked almost daily - the "Search Discussions" box to your right would have given you many hits with the same answer.

IPhone 3G cannot send mail - Sender address invalid

I can receive email but cannot send it. The error message is "CANNOT SEND MAIL the sender address was invalid". I have turned off Wi-Fi and as well as SSL. Does anyone know a fix?

Was it working before?
Verify that the ISP you are using is not blocking SMTP port 25. If so, try switching your Outgoing SMTP server to cwmx.com (AT&T SMTP server). This option will only send mail over 3G or EDGE.
Check out this article for some suggestions as well: http://support.apple.com/kb/TS1426

Cannot Send Mail Sender Address Invalid

when replying to an email, I receive this message. It is a POP3 account. I've experienced this in the iPod touch and reset the touch, it worked. Tried the same in the iPad, no luck. I've checked and rechecked that the smtp address is correct. I can receive but not send..help

I called and spoke with Apple at Apple Care.
Reset your iPad by holding the home key and power button simultaneously, wait for it to reset then, go to:
Settings>Mail,Contact,Calendars>select your email acct.>Advanced>Authentication>Password
Also under the Advanced, make sure "Use SSL" is turned on
Mine has worked perfect since Sunday morning.

Unsent message with Invalid Sender Address: NOT in OUTBOX!

I have an unsent email that is stuck "somewhere", the result of accidentally entering the incorrect email address when modifying a mobileMe account. When it tries to send, I used to get "Sender Address Invalid". But there are no messages left in the Outbox to delete.
So now at the bottom center of the MAIL screen it says "1 Unsent Message". And every so often it'll try sending it ("Sending 1 of 1). But then it'll just stop -- with no messages.
Restarting the iPhone doesn't clear it out.
Where is this message sitting? And how does one zap it?

One thing that might help out.
Go to settings > mail, contacts, calendars > your mail account.
Then tap on smtp to view all your servers.
Make sure your primary server is on.
Then go through and turn on all your secondary servers.
Go back into mail and see if you have an outbox with an unsent message.
Hope this helps.

IPhone 3G Cannot Send Mail. The sender address was invalid.

All of a sudden, I cannot send mail. I get the message "Cannot Send Mail" The sender address was invalid.
I have reset the phone in hopes of resolving the problem. That did not work.
The mail that I'm sending to IS a valid address; I'm trying to RESPOND.
Please help.

The configuration and use of any outgoing server address (SMTP) may not be supported due to several factors including, but not limited to, the inability for the outgoing server (SMTP) to authenticate users (whether by IP or username/password) that are not directly connected to that Internet Service Providers(ISPs) network.
This is usually your HOME wi-fi and you are not connected to it because you are on your iPhone away from the house. This is mainly done to prevent unsolicited users from sending SPAM via the ISP's servers.
An alternative is to use ATT SMTP Server (for US) when you are on the 3G or data network for the carrier and not on your home wi-fi. So enable ATT SMTP server under Other SMTP servers under your Mail's account settings on the iPhone.
If you are interested you can obtain that information directly from the email provider. This article has a great temple that you can use to ask all necessary information from the provider including "If you use your ISP’s own email service (instead of a third-party such as Gmail), sometimes it may not work if you use another Internet access point, such as a cafe with wireless Internet. Ask your email provider if the settings they give you will work on other networks."
What to ask if you're having issues sending, receiving, or configuring Mail
http://support.apple.com/kb/HT1277

Mail problem - "Sender address was invalid"

So I get this message from time to time: then I try to send an e-mail from the mail app on my iPod Touch, it'll come back to me saying "The Sender Address was invalid" and won't send it. However, it's gotten worse of late; previously, I would hit the refresh button and then it would send, but recently that has stopped working. For about 45 minutes this morning I tried to send an e-mail and it just wouldn't send. I ended up having to log into my e-mail manually (through Safari on my iPod) to get it to send (which worked). However, I would like to know if anyone else has encountered this problem, if anyone knows what causes it, if anyone knows how to solve it, and if it would be worthwhile submitting a bug report to Apple about this. Thanks.

With so many threads and indy websites posting this problem, I'm not sure where's best to post my solution. So it's here and I hope someone gets help from it.
Same thing - "sender address blah blah blah" and none of the fixes worked. So I deleted the outgoing server (or so I thought!) and restarted the iPod. The server was not listed.
Then I reentered the information and used Port 25 (I had tried that before but went back to the default port of 587 before deleting the old server).
I connected to my WiFi and my mail went thru immediately. But what was interesting was the 'old' server showed up as the backup with port 587. I don't dare touch a thing - it's working!
BTW, I am using my own website and mail servers (hosted elsewhere).
Interestingly, if the iPod is accessing the mail servers, the computer access is blocked. Probably my host no allowing multiple connections from the same location, but I've done that before with my laptop and other Macs here w/o a hitch. But really a big deal, but interesting.
Thanks to all who have posted in this thread and all the other threads. Together, we ARE tech support! But the Apple guys and gals are great as well. And this iPod Touch is AMAZING!

E-mail error: Cannot Send Mail: The sender address was invalid

I can receive e-mail but cannot send it. Everything goes to my outbox. I did not change any settings. Nothing has changed that I know of. For months I could send e-mail -- now I cannot. I even e-mailed myself, and it says the sender address is invalid. Can anyone help? Thanks!

The "Recipient addresses are invalid" message is misleading.
Most ISP's don't allow you to send email through their SMTP server unless you are A) on their network (e.g. connected via wi-fi to a cable connection provided by your ISP) or B) you authenticate to their SMTP server.
On Blueyonder here in the UK (my ISP), you can send via their SMTP server from the iPhone over 3G as long as you authenticate to it. I setup my Mac mail to authenticate on outbound email sent via smtp.blueyonder.co.uk and it works fine. I then synced the mail settings to my iPhone and it works fine (although a little slow to send).
Alternatively your cellular provider usually runs their own SMTP server to which you will also have to authenticate, and you can send through it. For the iPhone in the UK O2 are the exclusive provider, and they have the smtp.02.co.uk gateway.

Invalid sender address

Hi,
I have to send an email, but the sender address may be invalid, in which case I should suppy a "default" valid address. Is it possible to check that address before calling Transport.send(Message m, Address[] a)? Is there any isAddressValid() method?
Thanks,
Mgalois

No, an application cannot, but a library can. I finally found a solution: first I perform a "local" check of the email address (if @ char isn't present, if a dot isn't present after the index of @ etc.) then I send the message and check the exception message. If the message contains the string "Domain of sender address <the_address> does not exist" then the address isn't valid.

Outgoing mail unable to send "senders address invalid" how do I fix it?

I cannot send any mail from my icqmail /(aol ) accout. Every time I try to send mail it comes up 'senders address invalid'. Which I know it's not, but I can send mail trough my hotmail accout. I have my icqmail accout as default accout which is my main accout I need to be able to send emails! Help!

Hi..I am lucky, the Apple Store is right near me so I went to Genius Bar for help, we completey cleared out and reset my email accounts, AOL and .mac...basically started from scratch and let leopard set it up and then mail worked....However, then synching with my IPhone, I could not delete mail from my mail account...somehow some of the old server names were still there..so went in and deleted those.... and changed the setting save deleted mail on server to "no" and that solved it......
So my AOL in the Mail application is now working but I cannot attach in AOL..Called AOL and that seems to be a problem they are working on....

The sender address was invalid...

I know this has been discussed before here, but after trying various 'solutions', I'm still having the same message pop up and am unable to send mail from my iPhone.
After digging a little deeper on here I read that:
"The configuration and use of any outgoing server address (SMTP) may not be supported due to several factors including, but not limited to, the inability for the outgoing server (SMTP) to authenticate users (whether by IP or username/password) that are not directly connected to that Internet Service Providers (ISPs) network."
This makes sense (although, at the same time makes +no sense+, if you see what I mean) and would explain why it works when I'm at home using my WiFi connection and nowhere else.
BUT... there must be a solution.
I'm in the UK on the 02 network, I realise most responses here are US based but there must be some UK folks who have had the same problem and found an answer.
Please help... as always, all (sensible) responses appreciated.
Cheers.

have you tried uninstalling your email address, & reinstalling it again sometimes that works, if not maybe you could have another email address, ive found in the past that some fones don't seem to recognise windows live, so ive got google for my friend & family & kept the windows live one on my computer, hope this helps abit.

Roadrunner/cwmx and Invalid sender address problems

I have spent hours trying to fix problem with Road Runner email when not connected to rr via wifi.
Background: rr doesn't allow smtp outgoing if you aren't connected to their cable. Thus you have to be on wifi from your cable router. So, many folks turn on ATT cwmx.com smtp server to send mail when on 3G or Edge. iPhone email is supposed to try next smtp server if first one fails. But when sending mail many folks are getting "Invalid sender address" error message.
I had thought the error message was coming from cwmx but now think that it is coming from road runner's smtp server and the iPhone is not going on to the next smtp server, i.e. cwmx.com.
Maybe this is the problem/bug. I know there are some other bugs in iPhone mail app. For example I have 4 smtp servers showing in "Other SMTP servers" all with the same address and there is no way to delete the duplicates.

It is usually the ISP being used for the internet connection with the SMTP server restriction.
Most, if not all ISPs block the use of SMTP servers that are outside of their network (or that isn't provided by the ISP) unless the SMTP server is authenticated.
Most ISPs don't provide/support an authenticated SMTP server, and Time Warner is one of them. If TW provided/supported an authenticated SMTP server for RoadRunner accounts, using RR's SMTP server wouldn't be an issue regardless the internet connection.
I access my MobileMe account and a business POP account with the iPhone's Mail client. Both accounts have an authenticated SMTP server and I've never had a problem sending with either account regardless my internet connection - via numerous wi-fi connections with different ISPs or via EDGE with my first generation iPhone, or via 3G or EDGE with my iPhone 3G.
These restrictions are in place as a part of an overall effort to prevent spam emanating from the ISP's domain.

Reply address: is it possible to use another reply address other than the pop address used in my account. I have a special work account and would like to send emails with that address as my reply address...or sent from address

Reply address: is it possible to use another reply address other than the pop address used in my account. I have a special work account and would like to send emails with that address as my reply address...or sent from address

i found out how to do this finally!
1) set up google gmail account to forward your emails to (from the [email protected])
2) go to your gmail account
3) go to settings (cog in right hand corner)
4) go to 'accounts and import'
5) go to 'send mail as'
6) click 'Add another email address you own' - add your [email protected] address
7) google will send a verification email with code to that email address.
8) enter code
9) go back to gmail account >'send mail as' and select 'make default'
10) close mac 'mail' program and reopen it.
as long as you have gmail account selected as the primary account in MAIL - mail will now come throught as being sent from that [email protected] address!!

Another "Sender Address Invalid"

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