Issues Receiving some forwarded email message

[shirland]

I have an email account with Mail.com and have it setup so that all emails forward to my SkyYahoo email address.

This has been working perfectly for many years however recently I am having an issue with one specific sender.

When I receive an email from Barclays Bank telling me that my statement is ready, it is delivered to Mail.com with no issues however when it is auto-forwarded to SkyYahoo email it bouces back with error 553.

If I manually forward the email to skyYahoo there are no issues.

This is the only sender that it is happening with and is very frustrating. Any ideas or help would be much appreciated.

[Mark39]

Some possible solutions here; https://blog.warmy.io/blog/how-to-fix-smtp-email-error-553-5-3-0-solved/