[Users] Issue with ipv6 mail checking timing out

[Jerry]

On Thu, 23 Jul 2020 18:16:11 +0800, Chris Schrauben stated:
>The last two days I have been unable to fetch mail (timed out) from my
>Gmail (1) and Outlook (4) accounts. At first I was thinking my ISP
>(their service is not so good). I did some troubleshooting. These are
>POP3 accounts. I will use Gmail as the example, results are the same
>with Outlook using both pop-mail.outlook.com and outlook.office365.com.
>
>'telnet pop.gmail.com 995, result with "Trying
>xxxx:xxxx:xxxx:xxx::xx...trying to connect"
>
>Using ping -4 pop.gmail.com to get the ipv4 address I try 'telnet
>xxx.xxx.xxx.xxx 995 and get "Trying xxx.xxx.xxx.xxx... Connected to
>xxx.xxx.xxx.xxx."
>
>I don't see a way to force ipv4 by account, I do know there is a
>--disable-ipv6 configure option. So I rebuilt claw-mail with that
>option. All is well... for now. 
>
>Has anyone else experienced this issue (works with -ipv4, not with
>-ipv6).
>
>Before this I was having constant timeout problems with Gmail,
>sometimes it works some times it doesn't. I am now thinking this may
>have been the reason, when it worked an -ipv4 address was used, when
>it didn't it was -ipv6. 
>
>Thanks, Chris

https://support.google.com/mail/answer/7104828?hl=en

You need SSL for POP3. Telnet does not supply that. Use:

openssl s_client -connect pop.gmail.com:995 -showcerts

Post the results.

-- 
Jerry
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