Email is 'Sent' but does not reach destination - Please Help

Question

Hi Guys,
Need some help with this. I have recently discovered that all emails I have been sending from Mail over the last month or so have not reached their destinations.
I get no error messages when sending from Mail - the email is dispatched as usual, the sound is heard and mail deposited in my 'Sent' folder. I have tested this by emailing myself with no joy.
Interestingly, the 'webmail' facility via the internet works OK and emails are all received. So looks like the problem lies at my end.
Have checked the settings for the outgoing mail server (my current Portugal ISP) and they seem OK. I do not recall having touched anything here.
The mail account is one of those free POP mail accounts with my old UK ISP which I have continued to use successfully out here since august...that is until now!
I am using Port 25 without SSL and no authentication - everything as before. Have already tried changing the port to those mentioned in similar threads but nothing gives.
Any ideas would be greatly appreciated!
Many thanks
1.33GHz Powerbook G4   Mac OS X (10.4.2)  
1.33GHz Powerbook G4   Mac OS X (10.4.2)  

Answer 1

Hi Paulo.
If Mail puts the message in the Sent mailbox, that means Mail has got confirmation from the SMTP server that the message will be delivered. Whether the SMTP server actually does what it promised, or the message is filtered out by the recipient’s incoming server for some reason, is another story that Mail can do nothing about.
Interestingly, the 'webmail' facility via the internet works OK and
emails are all received. So looks like the problem lies at my end.
Sending messages via webmail is not the same as sending them via SMTP. If the problem is at your end, it’s at the server-side part of your end; more specifically, at the SMTP server part...