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Postfix
To use Mail250 as an SMTP relay for Postfix, create an API key with the ‘Send via SMTP’ permission enabled, then enter the following into your Postfix config file (typically main.cf):
smtp_sasl_auth_enable = yes
smtp_sasl_password_maps = static:SMTP_Injection:<your API key>
relayhost = [smtp.swipemail.in]:587
smtp_sasl_security_options = noanonymous
smtp_tls_security_level = encrypt
header_size_limit = 4096000