How come my mail won't send when I'm on a different network?

Jay42

macrumors 65816
Original poster
Jul 14, 2005
1,344
419
This is probably (hopefully) a simple question. I configured Apple mail to work with my gmail and comcast accounts, which works great when I am at home. But if I go other places, like to a friends house or a different wifi network, the mail bounces back when I try to send it and I get a message like this. Is there a configuration I can change so this won't happen?
 

Attachments


mad jew

Moderator emeritus
Apr 3, 2004
32,194
6
Adelaide, Australia
To keep an eye on possible spammers from their own network, some ISPs will not let you send mail through anything other than their own SMTP address. The best workaround is to either try using port 587 instead, or to use the ISP's own SMTP address.
 

AlBDamned

macrumors 68030
Mar 14, 2005
2,626
0
This is probably (hopefully) a simple question. I configured Apple mail to work with my gmail and comcast accounts, which works great when I am at home. But if I go other places, like to a friends house or a different wifi network, the mail bounces back when I try to send it and I get a message like this. Is there a configuration I can change so this won't happen?
You probably need a different outgoing mail server. So instead of comcast, it could be smtp.xnetwork.com.
 

Nugget

macrumors 68000
Nov 24, 2002
1,789
673
Houston Texas USA
mad jew is correct, the proper solution is to use a port other than port 25. That is, assuming your ISP offers SMTP relay services on an alternative port. The submission port (587) is what is most commonly used for this purpose, but sometimes you might find it on the ssmtp port (465) or even some totally off-the-wall port like 8025.

Try those and if none of them work, call Comcast and ask if they have any suggestions.
 

mkrishnan

Moderator emeritus
Jan 9, 2004
29,641
12
Grand Rapids, MI, USA
One caveat is that a lot of the ISP SMTPs (not sure about Comcast) don't allow for authentication or external access to their SMTPs (except maybe for their own accounts?). This complicates things because, if you're using the comcast SMTP right now, it may not work when you're elsewhere to switch it to port 587. The GMail one should work fine. I think, but I'm not sure, that if you set it up so that GMail uses Google's SMTP on 587, and Comcast uses Comcast's SMTP on 587, you'll be good.