Comcast is blocking my connection to Groupwise SMTP server offsite

I can not send email from my GroupWise smtp connection from my iPhone at home when connected to my WiFi across my Comcast internet connection. When I send an email it fails to send. If I turn off WiFi and let 4G connect to the GroupWise server it sends the email just fine. The email is being sent by Groupwise at a remote location but somehow Comcast is blocking the phones ability to hand off the info to the server even though the server is offsite sending out email on ATT DSL circuit. This also happens in Jackson MS on Comcast with a fellow employee of mine.
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Dave BaldwinConnect With a Mentor Fixer of ProblemsCommented:
Comcast blocks port 25 everywhere.  You will have to move to a different port, usually 587 but it depends on your mail server, for it to work again.
UtahTNAuthor Commented:
I'm attached through IMAP on the iPhone and my desktop PC is able to send email using the GroupWise client over Comcast. Are you saying my phone is not handing off the email to be sent by the server but my desktop is skipping Comcast. Is there an alter setup on the iPhone?
Dave BaldwinFixer of ProblemsCommented:
IMAP is just for receiving mail.  Check your SMTP (outgoing email) settings on your desktop and see if you can match them on your phone.
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Dave HoweConnect With a Mentor Software and Hardware EngineerCommented:
They block port 25 as stated - Run a second instance of the GWIA on a different port for mobile devices.
Mohammed KhawajaConnect With a Mentor Manager - Infrastructure:  Information TechnologyCommented:
Enable SMTP over ssl which is port 587 and they will allow it. I am sure your PC is configured for port 587.
Dave HoweSoftware and Hardware EngineerCommented:
The GWIA (the groupwise equivalent of an exchange smtp listener) doesn't have 587 by default, but you can run an instance of it on that port - its just a case of running the installer again, picking a different directory, and configuring it on the groupwise->network tab in console one to listen on 587 for smtp.
UtahTNAuthor Commented:
Verified that with a packet sniffer. Comcast is blocking all outbound on 25. It appears my iPhone connects on 25 to hand off content to GroupWise on 25. Will need to reconfigure GroupWise as advised. Thanks everyone.
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