I am looking for a freelancer who can assist to delist a domain from Spamhaus DBL and provide guidance why Mimecast rejects our e-mail with the following message:
Diagnostic-Code: smtp; 554 Email rejected due to security policies - [url removed, login to view]
We are sending e-mails via phpList. We do not want to change this platform.
We also need assistance with e-mail deliverability.
According to [url removed, login to view], there are a few items that requires fixing.