The SMTP Authentication Support (multiple) module (smtp_multiple) enables a site to maintain multiple SMTP server configurations based on the mail key used to send the mail.
The SMTP module permits the SMTP server username, password, to be set based on values set for the specific mail in $message['params']. However, values specified for the 'from address' and 'from_name' are overriden by the values configured in the SMTP modules configuration, e.g. 'smtp_fromname'.
[supriya1992 please replace this text with steps to reproduce, including installing both modules.]
By changing the code in the SMTP module so that $message['params']['from_name'] can override $this->smtpConfig->get('smtp_fromname'), the SMTP Authentication Support (multiple) module can be made to work.
However, doing so would break other sites that depend on $this->smtpConfig->get('smtp_fromname') having priority.
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
As smtp_multiple → seems to correctly override the SMTP configuration, I believe this issue can be closed. I'm not sure how OP encountered this here issue.
See 🐛 SMTP multiple configuration not working for from mail and from name Closed: cannot reproduce .