Authentication Error

Sync Issues
1

I keep getting this error on all my email addresses. To the point where I’ve had to move back to EMClient. I’ve no idea if this is the correct area to get help for this but I can’t send email from any account on Mailspring.

The error is on all accounts, 2 of which use completely different servers, so the problem isn’t with my email, it’s almost certainly with Mailspring.

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s isn’t as easy as it looks!
Read https://community.getmailspring.com/t/about-the-sync-issues-category
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Problem

Context

Email Provider

Setup

  • OS and Version:
    • Installation Method:
  • Mailspring Version:
2

me too
was happy to get the newest build - Version 1.17.2-a312df89
Now I can type Enter and Backspace keys, but I can’t send out a mail.
OS Windows 11 Pro

Re-adding in the email accounts doesn’t do the trick either, connection log shows these errors at the bottom

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

…they all come in BTW

3

I have the same error. Mailspring is totally unuseable right now

4

Same here,

for all my inbox, it’s impossible to use smtp :

Here the log when i try to reconnect the account :

----------IMAP----------
connect mailcore::IMAPSession:010FF8BC

  • OK [CAPABILITY IMAP4rev1 CHILDREN ENABLE ID IDLE LIST-EXTENDED LIST-STATUS LITERAL- MOVE NAMESPACE QUOTA SASL-IR SORT SPECIAL-USE THREAD=ORDEREDSUBJECT UIDPLUS UNSELECT WITHIN AUTH=LOGIN AUTH=PLAIN] IMAP server ready H mieue116 31.6 IMAP-1N9coN-1vq2ZX1F7F-015E3f
    TLS ssl connect imap.ionos.fr 993 2
    OpenSSL version: OpenSSL 3.6.0 1 Oct 2025
    connect ok
    login
    1 LOGIN “contact@opinoi.fr” *********
    1 OK LOGIN completed
    2 CAPABILITY
  • CAPABILITY IMAP4rev1 CHILDREN ENABLE ID IDLE LIST-EXTENDED LIST-STATUS LITERAL- MOVE NAMESPACE QUOTA SASL-IR SORT SPECIAL-USE THREAD=ORDEREDSUBJECT UIDPLUS UNSELECT WITHIN APPENDLIMIT=140000000
    2 OK CAPABILITY completed
    3 NAMESPACE
  • NAMESPACE ((“” “/”)) NIL NIL
    3 OK NAMESPACE completed
    login ok
    4 LIST “” “*”
  • LIST (\Drafts \HasNoChildren) “/” Brouillons
  • LIST (\Trash \HasNoChildren) “/” Corbeille
  • LIST (\HasNoChildren) “/” INBOX
  • LIST (\HasChildren) “/” Mailspring
  • LIST (\HasNoChildren) “/” Mailspring/Snoozed
  • LIST (\Sent \HasNoChildren) “/” “Objets envoy&AOk-s”
  • LIST (\Junk \HasNoChildren) “/” Spam
    4 OK LIST completed

----------SMTP----------
220 kundenserver.de (mreue108) Nemesis ESMTP Service ready
OpenSSL version: OpenSSL 3.6.0 1 Oct 2025
init
EHLO framework-13-vm
250-kundenserver.de Hello framework-13-vm [176.185.148.213]
250-8BITMIME
250-AUTH PLAIN LOGIN
250 SIZE 141557760

SASL_PATH:

SMTP Last Response Code: 250
SMTP Last Response: kundenserver.de Hello framework-13-vm [176.185.148.213]
8BITMIME
AUTH PLAIN LOGIN
SIZE 141557760

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

5

Same thing for me after last update to 1.17.2. SMPT connection failed when IMAP were ok. Rolled back to version 1.17.1 and now it’s work fine. Error has gone.

6

Same here, downgrade to 1.16 now and works

7

newest update 1.17.3 works here - win11