[rzelnik]

@wplove3268, I know that this is out of scope of the bbPress project, but IMHO the sender address should be configurable within the WordPress core. The current impossibility to change the sender address doesn’t make sense to me.

Anyway, maybe this article will help you:

Changing the wp_mail from address in WordPress without a plugin
http://www.butlerblog.com/2011/07/08/changing-the-wp_mail-from-address-in-wordpress-without-a-plugin/

[rzelnik]

So I tried a different e-mail configuration plugin: WP SMTP. The forum post notification emails are now delivered well. It’s strange that in the e-mail header there is the right sender address, while in the captured log there is still the default wordpress noreply@domain address, see here:

https://dl.dropboxusercontent.com/u/9349232/bbpress-email-testing/wp-mail-log-wp-smtp-forum-post.txt

Anyway, it is working well for me now.

[rzelnik]

Thank you Stephen for your answer. You are right with the BCC, it works as described. However, something causes that in the forum post notifications the “From” is set back to the default <noreply@domain.com>, although it is set to different/custom address by the WP Mail SMTP plugin. Here are two e-mail logs captured by the WP Mail Log plugin:

1. Forum post, e-mail notification sent to subscribed user(s):
https://dl.dropboxusercontent.com/u/9349232/bbpress-email-testing/wp-mail-log-forum-post.txt

2. BuddyPress Friend request sent to the requested user:
https://dl.dropboxusercontent.com/u/9349232/bbpress-email-testing/wp-mail-log-friend-request.txt

Both messages are sent from the same installation with the same configuration. You can see that the friend request has “From” address set to neodpovedaj@tvorivo.sk (the desired address), while the forum post notification has “From” set to noreply@forum-vyvoj.tvorivo.sk (which is wrong).

My web hosting service blocks the PHP mails sent from unknown addresses, so that’s the reason why the e-mails are not delivered. I will try if it works with some other E-mail/SMTP configuration plugins.

[rzelnik]

Update to my previous post: I have tried to debug the wp_mail input via WP Mail Log plugin. It seems that the bbPress doesn’t respect the e-mail settings. I have set outgoing (from) email address via WP-Mail-SMTP plugin. The rest of the WordPress email functions respect this setting, but the forum/topic notifications send the mails with default outgoing/from address (<noreply@domain.tld>). In addition, the recipient/to address of the sent emails is also noreply@domain.tld, despite the fact, that the recipients have their own email addresses set in their user profiles.