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When I try to get Gmail to pop mail from MS Exchange Server 2003 on port 143, Gmail comes back with the following error:

There was a problem connecting to mail.blah.com
Server returned error: "Missing +OK response upon connecting to the server: * OK Microsoft Exchange Server 2003 IMAP4rev1 server version 6.5.7638.1 (blah.blah.local) ready."

Looks to me like Gmail is expecting a +OK response and is getting confused by OK Microsoft...etc... reply. Is there a way to get this working, or would it require me trying to convince the company to upgrade the MS Exchange server?

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POP via IMAP.. might be the problem. Check your port. –  Grizly Sep 7 '10 at 23:17
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2 Answers

up vote 1 down vote accepted

Maybe my "comment" slipped you by, but my point is this: You can't access the POP service via the IMAP port number, Exchange replies based on the port you specify.

To access POP, usually you have to use port 110. If that port isn't being forwarded by your gateway, then you might have to configure it to do so. It should be relatively safe to allow the gmail IP ranges (below), rather than every IP.

$ nslookup -type=txt _spf.google.com
Server:     203.0.178.191
Address:    203.0.178.191#53

Non-authoritative answer:
_spf.google.com text = "v=spf1 ip4:216.239.32.0/19 ip4:64.233.160.0/19 ip4:66.249.80.0/20 ip4:72.14.192.0/18 ip4:209.85.128.0/17 ip4:66.102.0.0/20 ip4:74.125.0.0/16 ip4:64.18.0.0/20 ip4:207.126.144.0/20 ip4:173.194.0.0/16 ?all"
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Thanks, didn't know port 143 is IMAP, I was simply trying the various ports that Google provides on their interface and this was the only one that got any response at all. –  Stéphane Sep 9 '10 at 15:08
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