Opening port 25 outbound

Hi guys,

I seem to be able to only open port 25 from one ip address on my network.

Is there a way of opening it on any ip address, as i am migrating to office 365 and can migrate from one machine?

I have a cisco PIX 550
jonathanduane2010Asked:
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RizzleCommented:
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n2fcCommented:
Keep in mind restrictions placed on port 25 by your ISP...

Many ISP's (in a futile attempt to block SPAM) block port 25 anyway!

See the following articles for more info on this:

http://www.postcastserver.com/help/Port_25_Blocking.aspx

http://stackoverflow.com/questions/18139102/how-to-get-around-an-isp-block-on-port-25-for-smtp
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Jan SpringerCommented:
It's not your firewall unless you have an access list on the inside interface that either explicitly blocks this traffic or does not explicitly permit it.

If you are doing NAT behind the firewall using a single global IP or subnet, you shouldn't have an issue.

What do the firewall logs indicated when you attempt a [failed] smtp connection?
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