Loads of exim minalog errors: error:0A000126:SSL routines::unexpected eof while reading

[Richard G]

Just seen this happening when I send a mail, so I checked my exim logs and I get loads of these errors both on ipv4 and ipv6.

In my case I've seen it when a message to some company was completed via the server and then this line is added with my home ip.

2025-09-18 22:48:56 1uzLYl-000000007va-1JyL Completed
2025-09-18 22:48:56 TLS error (SSL_read): on connection from 2001-1c05-xxx-xxx-xxx-xxx-xxx-xxx.cable.dynamic.v6.ziggo.nl (PCNAME) [2001:1c05:xxx:xxxx:xxxx:xxxx:xxxx:xxxx] error:0A000126:SSL routines::unexpected eof while reading

But I've got loads of the same (mostly customers) in the mainlog too on all servers.
TLS error (SSL_read): on connection from [162.xxx.xxx.xxx] error:0A000126:SSL routines::unexpected eof while reading

I got this exim customisations on all servers in the exim.variables.conf.custom but I doubt this is causing it:

bounce_return_message = false
AUTH_ENABLE_CONDITION = ${if !eq{$interface_port}{25}}
AUTH_BLOCK_SENDER_SPOOFING = no

How can we fix this

 

[Richard G]

Found a similar issue here: https://forum.directadmin.com/threads/exim-started-but-no-response.70328/#post-372759
However, the docs show the line I have has nothing to do with TLS:

# Block SMTP authentication on TCP port 25, but allow it on plain-text connections on on other ports

So I'm confused now as I don't use port 25 anyway. In my example mail from above, port 465 with ssl was used.