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Topic: Can not connect to IMAP Server using Outlook and android Gmail

==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release): 1.3.2
- Deployed with iRedMail Easy or the downloadable installer? No
- Linux/BSD distribution name and version:  Ubuntu 18.04
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MySQL
- Web server (Apache or Nginx): Nginx
- Manage mail accounts with iRedAdmin-Pro? No
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
====

Hi, ZhangHuangbin

I have a problem with the connection to IMAP, I tried to connect my email to the server using outlook but an error occurred, the error that appears is
"We couldn't connect to the incoming IMAP server using the specified encryption method."
it's also the same as I'm using Gmail MUA on android
now I'm using 1 certificate with multiple SAN, and the certificate was created using certbot,I have used this certificate for 2 months and previously had no problems with Outlook , but when I tried to use Thunderbird or Roundcube no errors appeared.

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Re: Can not connect to IMAP Server using Outlook and android Gmail

- Is your client / device IP address blocked in Fail2ban? Maybe stop fail2ban service temporarily and try again?
- Any related error in Dovecot log files (/var/log/dovecot/*.log)?

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Re: Can not connect to IMAP Server using Outlook and android Gmail

sorry for the late update, after I try using Comodo SSL with 2 SAN, I can normally log in to outlook windows, and Gmail for Android, but when i using outlook for android the problem still occurs. i got no log that related to my problem with outlook android, what should i do?

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Re: Can not connect to IMAP Server using Outlook and android Gmail

Cannot help much without related log.
Did you stop fail2ban and try again? We need log lines.

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