WP= 4.3.1 bbPress= 2.5.8 Postman SMTP= 1.6.24

I’m learning WP by building a dummy site as a prelude to rebuilding camera club site. Work in progress at: http://www.snapsphotoservices.biz/
An important feature will be forums. I installed bbPress and all was good until I sent out test messages to selected subscribers. Despite the recipients getting the notifications correctly I was never the less presented with MDS errors: Mail Delivery System <MAILER-DAEMON@smtprelay08.hostedemail.com>Undelivered Mail Returned to Sender
Thinking I had server issues I moaned at my host who said “It’s not us…” As SMTP is said to be more reliable I added plugin Easy WP SMTP to the mix. It made no difference. I then tried Postman SMTP and created a new email address so that forums related to this and WP just dealt with original mail.
Strangely it’s this original mail that sent messages are referring to. Attached is a shot of the header a recipient sees. The Mochdre boot address is the address Postman is given and the snaps address is the default WP email address.

Hooray! It worked a treat, everybody gets the messages and I get no errors. Untill tonight when my inbox was filled with the old error messages.
Tried deactivating all plugins etc to no avail. How do I stop WP using its own snaps address when I’ve told SMTP plugin to use mochdreboot address? Or, if I create a mail account of noreply@snaps etc, what the heck happens to all the mail the server gets dumped with (assuming it would help)?
This is doing my head in. Please advise.

[@gene-stevo Participant 9 years, 1 month ago]

Oops! Stuffed up image post and don’t know who at-snaps is!
image of header from correctly received notification

[@robkk Moderator 9 years, 1 month ago]

Yeah this could be bbPress subscriptions having the issue.

See if installing and using this plugin will help you out.

https://wordpress.org/plugins/asyncronous-bbpress-subscriptions/

[@casiepa Moderator 9 years, 1 month ago]

Also ensure to have a good SMTP plugin like ‘Postman SMTP’ or equal. I like this one a lot because of all the debugging to understand where it goes wrong.

[@gene-stevo Participant 9 years, 1 month ago]

Thanks to both. I’ve done the asyncronous thing and run a test on dummy subscribers (without intruding on usual subscribers thanks to the wonderful “manage subscriptions” plugin).
So far so good. Messages received with proper To: field and no sign yet of any MDS errors.
Cheers, you guys are stars 🙂

[@casiepa Moderator 9 years, 1 month ago]

You’re welcome !

Pascal.