[RCU] Re: Connection failed - failed to reach server

On 23.07.24 15:41, Stephan Fourie wrote:

Sitting with an issue and hoping someone has some advice. We have a user where normal email sending works. But, when an email is sent to a large group and they click send, the circle button appears and after around 4

• 5 minutes the error 'connection error [failed to reach server]' is

presented.

How "large" is a "large" group in this case? Hundreds? Thousands? $deity forbid, tens of thousands?

Try to find out if Exim is taking so long validating the recipient addresses (for example because of "expensive" ACLs with callouts to external servers or DNS lookups, heavy SQL/LDAP queries, etc.) or if RC is spinning its wheels and then go from there.

Grüße, Sven.