Why VPS providers block port 25?
Nowadays, spamming is a very big issue. Every month around 300 billion emails are exchanged and out of that around 250 billion emails are spam. Therefore, in order to protect users from unwanted emails, ISP started blacklisting servers involved in spamming. There is also 3rd party spam monitoring agency that notifies ISP of spamming from the server and subsequently gets blacklisted.
Apart from that, blacklisted IP lowers the reputation of VPS providers and therefore affects sales. Also, sometimes the whole subnet gets blacklisted i.e. all 256 IPs.
Not only that, the law enforcement agency of the country can accuse/arrest the hosting provider for assisting in the spread of spam.
Therefore, the VPS provider in order to save their infrastructure from being abused simply blocks port 25. This means no emailing.
We know email marketing is very powerful in today’s interconnected digital world. The outright ban by VPS providers is hurting email marketers. Bulk email marketing service providers like Aweber, MailChimp, Sendgrid, etc., though efficient and powerful can be quite expensive. Therefore, self-hosted emailing infrastructure is the only solution.
Here, I have listed VPS hosting which provides open port 25.
Note: This is the list as of writing is up to date, but from time to time VPS provider can change their policies. Therefore, I request all readers of this article to email me ([email protected]), if you find any hosting listed below is no longer selling VPS with open port 25.