I have a VPS and when I send an email, I get a delivery error email with one of the following (the email is not in the spam, it is not being sent at all):
- all hosts for 'gmail.com' have been failing for a long time (and retry time not reached)
- host alt4.gmail-smtp-in.l.google.com [188.8.131.52] retry timeout exceeded
All other domains receive my emails with no problem. mail-tester grade is 10/10. MXToolbox is ok except for
Reverse DNS is not a valid Hostname: Your Reverse DNS Record (PTR) is not a valid host name. According to email sending best practices, a PTR Record should be a valid host name. If the PTR Record is not a valid hostname, there is a likelihood that you will experience email delivery issues with anti-spam services.
Is Google (and only Google) so sensitive about this issue that it can fail solely because of this issue? Can it be that Gmail is blocking my IP?
What frustrates most is that I have no indication about any problem, just a notification saying that the email was not delivered and that it will keep trying... Until it fails completely.
I have no problem receiving emails from Gmail. My mail is not marked as spam. The only issue is with Gmail, other providers work well.