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Connect Mailgun

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TL;DR
  • Host smtp.mailgun.org, port 587.
  • Use the SMTP credentials of your sending domain, found under that domain's settings in Mailgun.
  • Domains in Mailgun's EU region use the EU host shown in your domain's SMTP settings.
Setting Value
Host smtp.mailgun.org (EU-region domains: the host shown in Mailgun)
Port 587 (leave Use secure (TLS/SSL) off) or 465 (turn it on). 2525 also works if 587 is blocked
Username The SMTP login for your sending domain
Password That login’s SMTP password

Find your SMTP credentials

Section titled “Find your SMTP credentials”

In Mailgun, go to Sending → Domain settings, pick your sending domain and open the SMTP credentials tab. Credentials are set per domain, so use the ones for the domain in your From address. See Mailgun’s SMTP sending guide.

Before you send

Section titled “Before you send”

Add the SPF and DKIM records Mailgun shows for the domain and wait until it reports the domain as verified.