Given the ambiguity of the original request, either response could be correct. Invalid argument ($errorcode = 13) Learn how to send emails in php using smtp or api
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Phpmailer, symfony mailer, and mail () function
Sending the same email to multiple recipients using phpmailer is straightforward and flexible
The sendlayer sdk also supports sending emails to multiple recipients, including cc and bcc email addresses You have to create a completely different phpmailer object for the second email, or you could just use addaddress to send the same email to multiple addresses If you don't want the senders to see each other, use bcc. After about an hour of debugging i've discovered the meaning of the undocumented php warning
