Gmail is rejecting my vacation messages set in managesive filters, when I look qmail-send logs I find this:

2019-03-20 11:59:22.717746500 info msg 100921151: bytes 690 from <<>@my.default.domain> qp 12303 uid 89

2019-03-20 11:59:24.229429500 delivery 2: failure: Connected_to_64.233.190.27_but_sender_was_rejected./Remote_host_said:_555_5.5.2_Syntax_error._v3si1315429qth.170_-_gsmtp/

Hotmail accept it so I look in the message source code and find out the Return-Path is "<>"@my.default.domain. It seems the null sender <> is the default and recommended behaviour to prevent loops but apparently my problem is the something in the process is adding my default qmail domain after it. By the way, the email account used in this case belongs to another domain, not the default domain.
Does anyone have a clue why this is happening?


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