Simple Mail Transfer Protocol: How to create an Outgoing Mail Server Smtp.
This is what you must do to avoid the spam filter when setting up your outgoing SMTP server and sending out a lot of emails.
Acquire a static IP.
you’ll often get this from your Internet provider as part of your service, for the most part. Often, you'll just get a floating IP address, which can change after every connection you make to the Internet. With a dynamic IP, email servers won't recognize your IP address every time you send an email, and as such will block you. As a result, you should get a static IP from your provider in order to keep the same address each time.
Dynamic Name System (DNS).
It is also required that your local outgoing mail SMTP server is configured with forward & reverse DNS resolution. DNS resolution happens anytime a client asks a name server to locate the IP address of the person it desires to connect with. Anytime the name server in a local domain is unable to answer a client's request, the parent server is asked to locate a server that is able to.
This results in authentication that the email SMTP server that you're working from is valid through showing that the domain name owner and the IP address owner are the same people. If you can get your server validated, your trust score will increase dramatically.
It provides yet another way you can be found using your domain name should you begin to send spam. Typically, spammers and phishers do not want others to know their real name, so they fail to follow this rule. Instead, they utilize stolen or hijacked domains and IP addresses. All provider requires a type of ID, like a credit card, in order to register a domain.
A and PTR records are the processes that allow forward & reverse DNS resolutions to happen. These DNS records are important, so be sure to add them; getting DNS lookups require these. Your unobstructed Internet work will depend on this. This can be done by requesting it from your domain registrar or provider. With this accomplished, spam filters will start to trust you more.
It is important to remember that arranging the 'A record' does not automatically dictate that the PTR record has been arranged correctly. Be certain to double check with your provider.
Checking Black - List.
With the use of DNS queries you can access DNS blacklists, sometimes referred to as blacklists. The DNS blacklists are IP addresses stored in a remote database this is a list of IP addresses known to be the origins of spam. Filters and providers will look at the blacklist and block any mail coming from an IP address on the list.
If you find your email was blocked, you can check it on a blacklisted site. Once you see you are on the blacklist, you can use the manual directions for removing your IP from the list (almost all blacklist sites have these).
Sender Policy Framework (SPF).
while many of you may believe an SPF is a "sun protection factor", it is not. It is another type of DNS record that is very useful. It indicates which hosts have the right to send emails for a certain domain. SPF assists in showing that the source IP of the sender is authorized to transfer messages for a particular domain. Anytime you send an email from an IP that is not specified, the server may block it and/or tag it as spam.
If you're on the SPF record, servers can verify that your messages are legitimate. Check out Openspf.org, which can tell you everything you need to know about SPF and how you can use it to your full advantage. Get your SPF set up through your domain registrar or provider. Their configuration panel might have wizards that can help you. You can get automatic SPF setup for your emails.
Configuring Domain Keys (optional)
you may find that sometimes domain keys are used in validation, however, this is not often the case. It is debatable whether this will improve your trust or not. A very small number of providers will study domain keys.
With Domain Keys, email senders can be correctly identified. It's not unlike SPF in that it verifies that a legitimate person is sending the email through including cryptography in the email.
Although this does not filter spam independently, it can help with increasing trust for certain filters and providers. With the correct domain keys, it is expected filters will not mark your mail as spam.
That is all you need to know. By following these few rules, you will be able to act openly while communicating using the Internet.