Can't receive mail(exim). Connection times out/email delivery failed.
I am currently trying to set up a mail server, but I can't seem to be able to receive mail.
I used a Domain Health Check (mxtoolbox.com), which says that the connection times out after the initial connection is made.
This info is given by mxtoolbox.com:
Category / Host / Result
smtp / my.domain.ltd / 5.912 seconds - Warning on Connection time
smtp / my.domain.ltd / 8.533 seconds - Not good! on Transaction Time
smtp / my.domain.ltdl / OK - 18.104.22.168 resolves to my.domain.ltd
smtp / my.domain.ltd / OK - Reverse DNS matches SMTP Banner
smtp / my.domain.ltd / OK - Supports TLS.
smtp / my.domain.ltd / OK - Not an open relay.
Does anyone have an idea how to fix this? I didn't alter exim in any way, just installed it together with VestaCP. Sending mail works, by the way.