In order to allow you to use your own domain, we need to verify sender e-mail address in our email system. To avoid spam messages accumulation, email providers are blocking the messages, which are sent from unauthorized email hosts. The email host cannot send e-mails on behalf of another mailbox which is on another host.
In summary: email providers block messages when the domain IP address of the sender’s mailbox is different than IP server address from which this message is sent.
To settle this blockade, you have to add appropriate SPF and DKIM records, which will authorize our server to send emails from user’s mailbox.
1. Add an SPF record to your domain (Replace example.com with your own domain address).
Host: example.com Type: TXT Value: "v=spf1 include:spf.mandrillapp.com ?all"
2. Then add a DKIM record to your domain (again, replace example.com with your own domain address).
Host: mandrill._domainkey.example.com Type: TXT Value: "v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCrLHiExVd55zd/IQ/J/mRwSRMAocV/hMB3jXwaHH36d9NaVynQFYV8NaWi69c1veUtRzGt7yAioXqLj7Z4TeEUoOLgrKsn8YnckGs9i3B3tVFB+Ch/4mPhXWiNfNdynHWBcPcbJ8kjEQ2U8y78dHZj1YeRXXVvWob2OaKynO8/lQIDAQAB;"
3. When you’re done, send us an e-mail via firstname.lastname@example.org with basic information, like the name of your domain from which you want to send your autoresponder messages and exemplary e-mail address, where we sent a confirmation e-mail. We will verify SPF and DKIM records that have been added and unlock your domain.