Hi,
we are using libcurl in version 7.71.1 (32 bit) on Windows to send email using
SMTP. The login fails to some customers office365.com server. Here is the log.
I replaced some sensitive information with xxxxxxx, please apologise.
CURL: Trying 52.97.201.114:25...
CURL: Connected to smtp.office365.com (52.97.201.114) port 25 (#0)
CURL: 220 AM9P195CA0024.outlook.office365.com Microsoft ESMTP MAIL Service
ready at Thu, 21 Sep 2023 13:58:47 +0000
CURL: EHLO XXXXXXXXXX-102
CURL: 250-AM9P195CA0024.outlook.office365.com Hello [185.173.180.160]
CURL: 250-SIZE 157286400
CURL: 250-PIPELINING
CURL: 250-DSN
CURL: 250-ENHANCEDSTATUSCODES
CURL: 250-STARTTLS
CURL: 250-8BITMIME
CURL: 250-BINARYMIME
CURL: 250-CHUNKING
CURL: 250 SMTPUTF8
CURL: STARTTLS
CURL: 220 2.0.0 SMTP server ready
CURL: EHLO XXXXXXXXXX-102
CURL: 250-AM9P195CA0024.outlook.office365.com Hello [185.173.xxx.xxx]
CURL: 250-SIZE 157286400
CURL: 250-PIPELINING
CURL: 250-DSN
CURL: 250-ENHANCEDSTATUSCODES
CURL: 250-AUTH LOGIN XOAUTH2
CURL: 250-8BITMIME
CURL: 250-BINARYMIME
CURL: 250-CHUNKING
CURL: 250 SMTPUTF8
CURL: AUTH LOGIN
CURL: 334 xxxxxxxxxxxxxxxx
CURL: xxxxxxxxxxxxxxxxxxxxxx==
CURL: 334 xxxxxxxxxxxxxxxx
CURL: xxxxxxxxxxxxxxxxx=
CURL: Operation timed out after 8002 milliseconds with 0 out of 0 bytes
received
CURL: Closing connection 0
CURL: schannel: shutting down SSL/TLS connection with smtp.office365.com
port 25
Error performing GET. Curl ec:28
CURL Error Buffer content: Operation timed out after 8002 milliseconds with
0 out of 0 bytes received
It looks like only AUTH LOGIN XOAUTH2 is supported and the lib is trying AUTH
LOGIN. This was answered with silence for > 8 seconds and then timed out.
Is there some flag or option we need to turn on in libcurl to allow SMTP
sending through such email server?
I already found the CURLOPT_XOAUTH2_BEARER option, but to be honest I don't
know the process to get the values needed. From where do I get a Bearer Token?
Do I have to ask the customer on every sending for some token? Or is this some
setting the customer enters like a username and I have to save and use it? How
does this work?
Thanks!
Volker
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