Drupal 7：drupal_mail函数发送的邮件不超过12个收件人

Question

We have developed a meeting room module where we are sending invitation to invitees. But We are not able to send mail invitation more than 12 recipients.

Answer 1

There no reason here to think this 12 limit comes from Drupal. Suggested steps are:

• Write and test a very basic function sending mail to 13 or more recipients (better to use validated email address)
• Check your Drupal dblog
• Check then your mail server log

Answer 2

There was mail_logger module which was installed in system already. I increased the field "mailto" to VARCHAR(2047) in the mail_logger.install file.

Please refer below patch:

https://www.drupal.org/files/issues/2549049-3.patch After above changes done in mail_logger.install file run update.php to get new updates done in database.

That's It!!! Check now!! :)