Sending OK w/.mac, but not with other accounts

Every once in a while I am on a network that causes me trouble with sending mail.
I would assume it has to do with a firewall, but I'm guessing.
Recently I added a .mac e-mail account, and this account will send mail from one of my "problem" networks.
All of my other mail accounts give the4 message:
Cannot send using server mail.xxxxxxxxx.com
Use the pop-up menu below to try a different outgoing mail server. All messages will use this server until you quit Mail or change your network settings.
Is there anyway to get a different outgoing mail account to send?
The .mac account will not allow me to send from other accounts using the .mac outgoing mail account.
Thanks,
Luke

It all depends on the policy of whoever is the ISP at each location and the method used by the outgoing (SMTP) server to determine whether you’re a legitimate user. Note that when you’re not at home, the ISP at that location is usually not the same as the ISP when you’re at home.
In an attempt to fight spam, many ISPs restrict the ability to send using an outgoing (SMTP) server not owned by them, usually by blocking port 25 for all traffic outside their own network, which means you cannot send with an SMTP server not owned by them if configured to use that port number. And it may happen the other way around as well, i.e. the outgoing server itself may look at the IP address you’re connecting from and refuse the connection if you’re outside its own network.
Something that often works is changing the outgoing server port to 587 (or whatever alternate port number the outgoing server listens to) instead of 25 and using some form of authentication in Preferences > Accounts > Account Information > Outgoing Mail Server > Server Settings, but two conditions must be satisfied for this change to work: (1) the ISP must not block that port as well AND (2) the outgoing server in question must listen to that port and accept a form of authentication not based on the IP address you’re connecting from.
Independent mail service providers not tied to a particular ISP, such as .Mac and Gmail, do allow authenticated SMTP access on port 587, which is the reason changing the outgoing server port number solves the problem for them if the ISP doesn’t block that port as well.
.Mac doesn’t allow sending from a non-.Mac address, but Gmail does. If you have a Gmail account, you may use Gmail's SMTP server to send from your other mail accounts as well as follows:
1. Log into your Gmail account on the web.
2. Go to Settings > Accounts.
3. Enable the addresses you want to be able to send from, and let Gmail validate them by verifying that you do indeed own them.
4. For each mail account you want to send from using Gmail’s SMTP server, in Mail go to Preferences > Accounts, and choose Gmail’s SMTP server from the Outgoing Mail Server (SMTP) popup menu.

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