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SMTP Error: 501 5.1.3 Bad recipient address syntax on empty Config.adminEmail · Issue #230 · dereuromark/cakephp-tools · GitHub
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Sending email from Fisheye fails due to 501 Syntax: HELO hostname error | Fisheye | Atlassian Documentation
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501 5.1.7 Bad sender address syntax` in SMTP username with @domain.tld part · Issue #3181 · zammad/zammad · GitHub
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SMTP server response: 501 5.1.7 Bad sender address syntax in... · Issue #169 · swiftmailer/swiftmailer · GitHub
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SMTP Protocol Error: 501 5.1.7 Bad sender address syntax when sending mail from our printer through Nethserver - Support - NethServer Community
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