Warmup Inbox does allow MailGun inboxes. Before connecting you need to

1. Have a properly configured Mailgun account

2. Locate your SMTP Credentials

1. Your SMTP credentials are different for each domain under Mailgun. For the inbox you are attempting to connect to the platform, you can find your default credentials by clicking through to your domain settings.

Once complete, here are the SMTP settings you should utilize.

SMTP ONLY Option

Email Provider: MailGun Email

SMTP Settings:

• SMTP Username: {{your default SMTP login}}

• SMTP Password: {{your default SMTP password}}

• SMTP Host: smtp.mailgun.org

• SMTP Port: 465 (At times Port could also be 0)

• SSL/TLS: ON

Once you have this information, you can get set up on Warmup Inbox by selecting the MailGun integration option.

Please note, that you can use the MailGun integration only if you have purchased the Send-only plan.

SMTP & IMAP Option

With the trial, Basic, Pro, and MAX plans, you can connect your MailGun account only when creating an IMAP connection. The email address for the IMAP connection must be the same email address as the one you specified in the SMTP.

In this case, instead of using the MailGun integration, you will connect your inbox using the SMTP & IMAP option.

For the IMAP part, you will need to gather this information from the inbox that will be receiving emails :
​
​IMAP username: the email address of the inbox that will be receiving emails
​IMAP password: the password from this inbox. If it´s a Google inbox, you will need to create an app password and use it instead of the regular password from your inbox.
​
Here are the instructions:
​https://help.warmupinbox.com/en/articles/4934806-configure-for-google-workplace-with-two-factor-authentication-2fa?location=conversation

​IMAP host:
​IMAP port: typically 993 (or you can use 143)
​SSL/TLS: using port 993 - ON, using port 143 - OFF
​

Note: the SMTP/IMAP option doesn´t work with Office365 accounts as they disabled the Basic authentication in 2023.