“Simple Mail Transfer Protocol – (from “simple mail transfer protocol”) is a network protocol that is designed to transfer mail.”
The term is often confused with IMAP and POP. But SMTP is a protocol for sending mail, when IMAP and POP ー handling the internals after receiving the mail.
So it is not for decryption, SMTP Server is designed for transmission only, mainly for bulk campaign.
What it is for and what types exist
SMTP server is a kind of mailman. Its task is to take the “parcel” from one user, find the optimal and accurate path of transportation and give it to another user.
Conditionally divided into:
Ordinary.
For personal correspondence. More often they belong to providers of web-hosting, internet networks, etc. But the peculiarity is that the amount of mailings is limited, usually for a day.
Special repeaters.
This is a server for mass and transactional email campaign. The limit ends at millions. You can not be afraid that the IP will be blocked.
They are also classified depending on the source:
From ISPs.
Does not require separate skills, but there is a limit on the number and speed of sending. The amount depends on the selected tariff.
From free email services.
Yandex, Gmail, Yahoo allow you to send out on relays. You need to authorize under a personal account, specify the port and encryption. Suitable for use from a mobile device. But the limit in the section from 150 to 500 emails per day.
From hosting providers.
If you have a site, you can use Simple Mail Transfer Protocol hosting. But with spamming from hundreds of sites with one IP, it will be blocked by mail services. To avoid blocking, better rent a virtual SMTP.
From email services
The number is limited by desire. How many you need, so much and buy. You can send from the site, CRM or application, after registering an account.
Advantages:
High deliverability
To reduce spam, email clients restrict or block email inboxes altogether. With SMTP, the likelihood of blocking is close to zero, due to user authorization. Since, the login and password on a particular service are taken into account while logging into the account, and mailers have fewer questions for real people.
Secure interaction
What is an SMTP server? It is only a delivery person, it does not look inside the mail and does not save personal data. Information about the client base is stored only with you.
Millions of emails in minutes
Quickly exchange and follow up information in your personal account or PC app.
Does not require installation of special software
It is enough to understand the principle of operation and apply a simple set of commands. No additional installation is required.
Reporting on deliverability and sending errors
In case of failure to send information even after several attempts, the owner automatically receives a failure message.