Problem with SMTP login on version 1.17.2 Windows

Bug Reports
,
1

Description

I’ve had problem with SMTP auth on 3 IMAP mail server. All says the same error that is wrong username and password on version 1.17.2.
Recieveing mails is ok, but cannot send. After downgrade to version 1.17.1 all is ok again.

Log:
SMTP Last Response Code: 250
SMTP Last Response: *******************
8BITMIME
AUTH PLAIN LOGIN
BURL imap
CHUNKING
DSN
ENHANCEDSTATUSCODES
SIZE 50000000
PIPELINING
VRFY

mailsmtp Last Error Code: 296
mailsmtp Last Error Explanation: Unknown
mailsmtp Last Error Location: 10
mailsmtp Last Auth Type: 2

To Reproduce…

Steps to reproduce the behavior:

Expected Behavior

Screenshots

Screenshot 2026-01-26 102156

Setup

  • OS and Version: Windows 11
    • Installation Method:
  • Mailspring Version: 1.17.2 (later downgrade to 1.17.1 tested and work)

Additional Context

2

Same problem here.

windows 11

1.17.2

----------IMAP----------
connect mailcore::IMAPSession:0055F9D8

  • OK [CAPABILITY IMAP4rev1 LOGIN-REFERRALS ID ENABLE IDLE SASL-IR LITERAL+ AUTH=PLAIN AUTH=LOGIN AUTH=DIGEST-MD5 AUTH=CRAM-MD5] Dovecot ready.
    TLS ssl connect myd**********.gr 993 2
    OpenSSL version: OpenSSL 3.6.0 1 Oct 2025
    connect ok
    login
    1 LOGIN “info@myd**********.gr” “*********”
    1 OK [CAPABILITY IMAP4rev1 SASL-IR LOGIN-REFERRALS ID ENABLE IDLE SORT SORT=DISPLAY THREAD=REFERENCES THREAD=REFS THREAD=ORDEREDSUBJECT MULTIAPPEND URL-PARTIAL CATENATE UNSELECT CHILDREN NAMESPACE UIDPLUS LIST-EXTENDED I18NLEVEL=1 CONDSTORE QRESYNC ESEARCH ESORT SEARCHRES WITHIN CONTEXT=SEARCH LIST-STATUS BINARY MOVE REPLACE SNIPPET=FUZZY PREVIEW=FUZZY PREVIEW SPECIAL-USE STATUS=SIZE SAVEDATE COMPRESS=DEFLATE INPROGRESS NOTIFY LITERAL+ QUOTA] Logged in
    2 COMPRESS DEFLATE
    2 OK Begin compression (0.001 + 0.000 secs).
    3 ENABLE QRESYNC
  • ENABLED QRESYNC
    3 OK Enabled (0.001 + 0.000 secs).
    4 NAMESPACE
  • NAMESPACE ((“INBOX.” “.”)) NIL NIL
    4 OK Namespace completed (0.001 + 0.000 secs).
    login ok
    5 LIST “INBOX.” “*”
  • LIST (\HasChildren \UnMarked) “.” INBOX.Mailspring
  • LIST (\HasNoChildren \UnMarked) “.” INBOX.Mailspring.Snoozed
  • LIST (\HasNoChildren \UnMarked) “.” INBOX.Saved
  • LIST (\HasNoChildren \UnMarked) “.” INBOX.Templates
  • LIST (\HasNoChildren \UnMarked) “.” INBOX.Archive
  • LIST (\HasNoChildren \UnMarked \Junk) “.” INBOX.Spam
  • LIST (\HasNoChildren \UnMarked \Drafts) “.” INBOX.Drafts
  • LIST (\HasNoChildren \UnMarked \Sent) “.” INBOX.Sent
  • LIST (\HasNoChildren \UnMarked \Trash) “.” INBOX.Trash
    5 OK List completed (0.001 + 0.000 secs).
    6 LIST “” “INBOX”
  • LIST (\HasChildren) “.” INBOX
    6 OK List completed (0.001 + 0.000 secs).

----------SMTP----------
220 server60.happybyte.gr ESMTP Postfix
OpenSSL version: OpenSSL 3.6.0 1 Oct 2025
init
EHLO TURBOX
250-server60.happybyte.gr
250-PIPELINING
250-SIZE 67108864
250-ETRN
250-AUTH DIGEST-MD5 CRAM-MD5 PLAIN LOGIN
250-ENHANCEDSTATUSCODES
250-8BITMIME
250-DSN
250 CHUNKING

SASL_PATH:

SMTP Last Response Code: 250
SMTP Last Response: server60.happybyte.gr
PIPELINING
SIZE 67108864
ETRN
AUTH DIGEST-MD5 CRAM-MD5 PLAIN LOGIN
ENHANCEDSTATUSCODES
8BITMIME
DSN
CHUNKING

mailsmtp Last Error Code: 296
mailsmtp Last Error Explanation: Unknown
mailsmtp Last Error Location: 10
mailsmtp Last Auth Type: 2

3

While adjusting settings and accounts, I managed to find a temporary workaround.
I installed the previous version of the application (v1.17.1) and removed the Update.exe file from the application folder in order to prevent automatic updates, until the specific bug is fixed.

2 Likes
4

Is it a global Oauth code applied to non Oauth code venues?
My Hotmail, Gmail working (sending/Receiving) but now Spectrum not.
1.17.2