XF 2.1 Email problems - xyz Replied to A Thread You are watching

[DigNap15]

Hello, every day I get about 20 bounced emails.
They are mostly
xyz replied to a Thread You are Watching at My Forum
I have checked with the destination email and they are valid
And my email server tells me there is no problem
But something is wrong
Some of Mail delivered Failed messages have "SE22Mailspamprotection.com
Ay suggestions please?

 

[Hoffi]

Looks like some Providers has listet your Server as a SPAM server. Are you sending eMails form your own Server, or do you use a provider?

 

[DigNap15]

Hi, my webhost is Siteground and they are my email server