XG 18.0.4 M4-4 Mac Mail IMAP unable to connect (DPI issue)

Hi,

I created anew yahoo account because I can't remember the password or setup on my old one.

Testing, I saw the following ports 143, 443, 585 and 993 all trying to talk to the  mail server imap.mail.yahoo.com. All validation attempts failed with or without using the HTTP proxy. No errors logged in the XG.

Result, total failure.

Ian

Try MR5. community.sophos.com/.../xg-firewall-v18-mr5-is-now-available

Thanks for taking the time to test that out rfcat_vk, appreciate it.

Working as expected now with MR5, thanks LuCar Toni.

• No exclusions needed.
• No firewall rules needed.
• SSL/TLS inspection on or off, works fine.

interesting, my mac mail will not connect with or without XG involved, verification fails for Yahoo mail.

According to Sophos there are NO fixes for DPI in MR-5, testing was not completed in time to be added.

Ian

EDIT: Sorry just saw you said with or without XG involved, different issue entirely ?

I think I read in some of your other posts that you have mail scanning options enabled to make Mac's Mail app work ?, do you want to scan mail ports ?, could you try turning off any mail scanning enabled ?

So with my setup now on 18.0.5 MR-5:

• Default network rule does not have any mail scanning enabled (Scan IMAPS and Scan SMTPS not ticked), firewall is NOT in MTA mode.
• SSL/TLS inspection on
• Web > URL groups > "Local TLS exclusion list" is empty.
• No firewall rule for Yahoo or any mail port handling.

Default network rule Security & Other settings:

Mac Mail Connection Doctor app:

Hi,

I scan mail in an attempt to catch virus and spam. Scanning works for all mail accounts on mac mini, mac air, iPad and iPhones.

Yahoo smtp worked with scanning when the CA was told to trust the site, though the Yahoo CA is invalid.

I am at  loss to understand why Yahoo Spam fails to verify? I will ask in other forums though the answer is not of great interest because I do not use Yahoo mail on a regular basis.

Ian

Ah no worries, don't worry about finding a fix as my problem has now been resolved, can leave it there.