I put this here in the WordPress section, but I do not believe it is a WordPress issue.
For some reason now suddenly any automated email send from my WordPress blog is not sent or with a delay of a few days.
E.g. if I create a new member manually neither he/she gets the standard email which includes the user/pwd or me as admin get the new member registered email.
Also any plugin that sends out automated emails, they also do not arrive.
I have had the same blog for years and have changed nothing in the settings.
This happened before a few months ago and then suddenly the emails were sent again, but now no more emails.
Any manually sent emails works fine.
The emails are also NOT in the webmail. I do not use that, but checked just in case.
The first time it happened I sent a support message, but they could not find anything wrong and then suddenly all worked again.
I have the same setup on a secondary server as extra testing (not DH) and all emails are sent with no problems.
The strange part is that it comes and goes, so changing any settings (which have been the same for years) will not solve this, since I am sure the settings are fine.