Undeliverable from co.za addresses

[Jim-Murray]

Recently ( past 4 months) all emails from co.za are being bounced back as undeliverable. I had to open a Gmail account to get messages, My address has not changed in over 10 years and all emails used to be
Delivered ok! What could be the problem

 

[DrWizzle]

Have you checked you've not been blacklisted?

Try online checkers like

https://check.spamhaus.org/

https://mxtoolbox.com/blacklists.aspx ,

https://www.zerobounce.net/blacklist-checker

You could also check your spam filter settings, and any blocklists, or Geo IPs you might have in your access control list you may have? There are other members on here that will comment below i'm sure who can help with the mechanics of EXIM, SpamAssasin and Rspamd