error string as "SMTPSender: no recipients, email send ignored" in email (logs)

[Ramu8]

Hi Team

notification configured on sc_task table and this is using
action:inserted/updated record trigger
condtion: assignment group changes

Users/Groups in fields: Assignment group

notification is triggered but it showing empty recipients and below error and the type is send ignore
error string as "SMTPSender: no recipients, email send ignored" in email (logs)

[Dr Atul G- LNG]

Hi @Ramu8 

https://support.servicenow.com/kb?id=kb_article_view&sysparm_article=KB0853472

Issue

You can identify this issue by reviewing the email logs when investigating why a user did not receive an expected notification.

In the email log, the message will appear with a Send-Ignored state and the following error message: 

SMTPSender: no recipients, email send ignored. The value in the recipient is not a valid email 'name@name_domain.xxx'

Release

Cause

As per section 3.4 of the Internet Message Format Standard RFC5322, the _ (underscore) is an illegal character in the address domain, so JavaMail rejects the address.

Resolution

This is not a ServiceNow platform issue, as the behaviour is expected.

In order to resolve this, the domain part of the email address needs to be corrected to conform with section 3.4 of Internet Message Format Standard RFC5322.

https://www.servicenow.com/community/developer-forum/smtpsender-no-recipients-email-send-ignored/m-p...