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SMTP server error "550 Unsupported ESMTP extension" on MAIL FROM:... AUTH=<> [with fix] #164

jsdza opened this issue Apr 25, 2016 · 2 comments


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@jsdza jsdza commented Apr 25, 2016

hMailserver SMTP server erroneously aborts an inbound ESMTP connection if the MAIL FROM line contains the parameter "AUTH=<>"

This parameter should be ignored, however hMailserver is not parsing it correctly because of the following typo at line 473 of SMTPConnection.cpp:

473: else if (parameter.Left(**5**).CompareNoCase(_T("AUTH")) == 0)
where '5' should really be '4' (no of chars in "AUTH").
Correcting the count to 4 resolves the problem.
(Apologies for not submitting a proper patch for this 1 character fix)

@martinknafve martinknafve added this to the 5.6.5 milestone Apr 28, 2016
@martinknafve martinknafve modified the milestones: 5.6.5, 5.7 Apr 28, 2016
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@martinknafve martinknafve commented Apr 28, 2016

Thanks, fixed. Please note that this issue only exists in master branch, which is not a released version. In other words, please be aware that there may be more issues in this branch.

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@jsdza jsdza commented Apr 28, 2016

Most welcome. Thanks for a truly impressive piece of software (both inside and out!)

RvdHout added a commit to RvdHout/hmailserver that referenced this issue Aug 6, 2017
- Fixed Incorrect DEBUG logging for event 'OnDeliverMessage' hmailserver#181 hmailserver#181
- Include HTMLBody into IMAP TEXT search hmailserver#193
- Fixed implicit conversion: "int" to "unsigned char" hmailserver#204
- Faulty: SMTP 'Disconnect client after too many invalid commands' hmailserver#160 hmailserver#160
- SMTP server error "550 Unsupported ESMTP extension" on MAIL FROM:... AUTH=<> [with fix] hmailserver#164 hmailserver#164
- Remove 15GB backup limit hmailserver#69 hmailserver#69
- Speed up 'update hm_messages set messageflags' hmailserver#221 hmailserver#221
- (Ofice 2016 Read-Receipt Bug)
- Add Return-Path as topmost header before sending the message to SA (+ delete Return-Path header after the SA check completes) hmailserver#116
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