On ours VDS any mass mailing is automatically blocked. For prevention of mass infringements of the rules we are compelled to limit 25 and 465-th ports on servers in locations RU (Moscow)
To unblock, you need to apply for opening a port and provide the following information:
- How subscribers agree to mailing?
- Screenshot with the form of a subscription or a screenshot of the form of registration
- Example of the letter from mailing (an initial code) and a screenshot of the letter
- The letter must contain a link for a quick unsubscribe
- Screenshot of the page for unsubscribing, which is opened by the link in the letter
- Unsubscribing must occur without authorization on the site
