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I have several email accounts, which use outlook 2007 and outlook 2016, when migrating them to the new server they cannot connect, they give a protocol error

Hello,

We're tired of guessing. Provide more details.

Try this, edit /etc/ssl/openssl.cnf

Edit or add this to:
Modern systems have set the Seclevel to 2, very old programs can't deal with that.

It may solve it. As Seclevel 2 has a higher encrytion than the level 0 and level 1, still used by old programs.

You could also try edit the TLS version to 1.1 or 1.0.

Outlook before 2019 supports only POP3.
Do not try IMAP.

Tobi wrote: ↑Thu 6. Oct 2022, 18:30 Outlook before 2019 supports only POP3.

Seriously?

OK: From the men who brought you edlin …

Don't think so, one of my clients uses it with IMAP.

Tobi wrote: ↑Thu 6. Oct 2022, 18:30 Outlook before 2019 supports only POP3.
Do not try IMAP.

This statement is wrong

HI

I have same problem
my customer use outlook 2007 with windows 7 and i can connect with pop or imap and smtp to keyhelp

i add thunderbird for try, imap is ok but he can't send

what i must modify in keyhelp for using outlook 2007 or thunderbird

thanks for you help

stéphan

Hello

1) Have a look into the logs when connecting.

2) As the customer uses outdated software, lower the "Minimal TLS protocol version" here settings: Configuration -> TLS Version & Ciphers and use the appropriate ciphers https://ssl-config.mozilla.org/
Be aware that you are lowering the security of the entire server and all customers and should rather encourage the customer to update, not only for the sake of your other customers / of your server, but also for his own sake.