Since a few days, GMX.de and Web.de do not accept any more redirected E-Mails which do not change her Header to an SRS (Sender Rewriting Scheme) valid E-Mail Header to do an valid SPF Check. Cause of this problem, we get actually some Errors from our customers. I have searched for a way of implementation and would like to ask if it would be possoble to generate an Plugin für the new I-MSCP Version:
email@example.com>[/email] (expanded from firstname.lastname@example.org>[/email] host mx-ha02.web.de[22.214.171.124] said: 550-Requested action not taken: mailbox unavailable 550-Reject due to SPF policy. 550-The originating IP of the message is not permitted by the domain owner. 550 For explanation visit http://postmaster.web.de/error-messages?ip=82.211.xxx.xxx&c=spf (in reply to MAIL FROM command)
This is the return from the web.de and gmx.de Mailservers.