Mass email is not working

[grad]

Hi,

I have defined a return address for Emails but somehow it is not placed in the email.

The admin email address is            forum@xxxxx.org
The return address is                     [email protected]xxxxx.org


Php7 + latest myBB

Email server:

16:56:12.352 2 SMTPI-004633([127.0.0.1]) ACCOUNT([email protected]) connected(CLRTXT) [127.0.0.1]:39731->[127.0.1.1]:25
16:56:12.352 2 SMTPI-004633([127.0.0.1]) ACCOUNT([email protected]xxxxx.org) disconnected ([127.0.0.1]:39731)
16:56:12.387 2 SMTPI-004633([127.0.0.1]) authenticated as [email protected]xxxxx.org
16:56:12.387 5 SMTPI-004633([127.0.0.1]) out: 235 [email protected]xxxxx.org relaying authenticated\r\n
16:56:12.388 5 SMTPI-004633([127.0.0.1]) inp: MAIL FROM:<[email protected]xxxxx.org>
16:56:12.388 5 SMTPI-004633([127.0.0.1]) out: 250 [email protected]xxxxx.org sender accepted\r\n
16:56:12.388 5 SMTPI-004633([127.0.0.1]) inp: RCPT TO:<>
16:56:12.388 5 SMTPI-004633([127.0.0.1]) out: 501 syntax error\r\n
16:56:12.389 5 SMTPI-004633([127.0.0.1]) inp: MAIL FROM:<[email protected]xxxxx.org>


The strange thing is that if I do a mass email with only the administrators everything works fine. Mass email BBoard wide fails.

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I think that this whole mass email is broken. If I remove return address and only admin address still the same problem. I also have:

17:06:55.069 5 SMTPI-004648([127.0.0.1]) inp: MAIL FROM:<[email protected]>
17:06:55.069 5 SMTPI-004648([127.0.0.1]) out: 500 Unknown command\r\n

Coming from phpBB I never had any mass email problems.