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Messages with multiple addresses in From: header are not accepted
The core issue is non-delivery, bouncing, based on Gmail deciding that there are too many addresses in the From header. Here is the exact From header they rejected:
```
From: [email protected] Reply-To: [email protected] Return-Path: [email protected] Sender: [email protected] MIME-Version: 1.0 Message-ID: [email protected] Date: Thu, 29 Apr 2021 18:36:39 +0000 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: phpBB3 X-MimeOLE: phpBB3 X-phpBB-Origin: phpbb://mysite.com X-AntiAbuse: Board servername - mysite.com X-AntiAbuse: User_id - 1 X-AntiAbuse: Username - Anonymous X-AntiAbuse: User IP - xxx.xxx.129.144
```
SPF and DKIM are all passed, no spam flags set, domain not listed anywhere for spam