Issue 550-5.7.26 This message does not have authentication information or fails

[dblii]

Hi from today i get the following message in my inbox while i try to send emails. I using gmail with my own domain name email. i check all your suggestion in the forum but not working. which is the way to fix this problem? I cannot send emails.

said:
550-5.7.26 This message does not have authentication information or fails
to 550-5.7.26 pass authentication checks. To best protect our users from
spam, the 550-5.7.26 message has been blocked.

 

[Kaspar]

Did you setup an SPF record for your domain?

 

[dblii]

Yes I have already added

 

[Kaspar]

Can you post your SPF record?

 

[IgorG]

Have you seen this KB article Plesk notifications cannot be delivered to the recipient: 550-5.7.1 (or 550-5.7.26) This message does not have authentication information ?

 

[dblii]

here it is

 

[dblii]

sure i follow the article instructions

 

[Kaspar]

sure i follow the article instructions

No, you did not. The first point given on the KB article says "Set correct rDNS for the server". However there is no (matching) rDNS for your server.

 

[dblii]

this article: Plesk notifications cannot be delivered to the recipient: 550-5.7.1 (or 550-5.7.26) This message does not have authentication information ?
is the same with this? "Set correct rDNS for the server".