Hi - the solution given above (replacing JAR files) is actually no longer valid.
There was in fact an issue with Java Mail JARs in 15.1 era, but it turns out that was a Java issue where they were updating protocols (for security reasons).
As it turns out, not only is DLP v15.1 End of Service, but the actual solution is to simply require Authentication at your SMTP server (as indicated by Vibu in above comment).
This is noted in the
15.7 Release Notes, under "Known Issues":
Issue = 4231954
Description = As of version 15.0, Symantec Data Loss Prevention no
longer supports anonymous logins to the SMTP server that
is used for sending out alerts and reports. You must enter
a valid user name and password.
Workaround = Don't use anonymous login to the SMTP server that you
use to send out alerts and reports.
Hopefully this is helpful! Please contact Support if more assistance is needed.
------------------------------
Global Support Lead, DLP
Broadcom, Symantec Enterprise Division
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Original Message:
Sent: 01-13-2021 04:09 PM
From: Fady azab
Subject: Unable to connect to SMTP server
hi
could you please send it to by mail
fady.azab@cc-it.de
------------------------------
Fady Azab
Senior Consultant
CCIT GMBH
Original Message:
Sent: 01-13-2021 07:33 AM
From: Vibu Varghese
Subject: Unable to connect to SMTP server
Hello Fady,
As of version 15.0, Symantec Data Loss Prevention no longer supports anonymous logins to the SMTP server that is used for sending out alerts and reports. You must enter a valid user name and password.
Trying to upload mail.jar file but it is not uploading here.
Original Message:
Sent: 01-13-2021 05:38 AM
From: Fady azab
Subject: Unable to connect to SMTP server
Hi Guys ,
i have the same problem with version 15.7 MP1 , can anyone pass me these files , i have contacted the support 4 weeks ago and i didnt get any response yet
Thanks
------------------------------
Fady Azab
Senior Consultant
CCIT GMBH
Original Message:
Sent: 02-20-2019 03:33 PM
From: Ridhi Singh
Subject: Unable to connect to SMTP server
Hi Pan,
Thank you for confirming that you were able to get it fixed with the steps provided.
Have a good day ahead.
Regards
Ridhi Singh