Email Magnifier email test process algorithm explained

How we verify an email address

• We check the email address syntax.
• We check if domain name exists in DNS.
• We check if domain has MX records.
• If the 'Check negative response possibility' option was chosen, the system will check the test possibility on the MX record with higher priority.
  When the connection to the SMTP server failed, we try to connect to the next server by priority.
  If the 'Analyze all MX records' option was selected, the system will check the test possibility on all MX records on the server.
• We check the email address on the MX record with higher priority (see the Procedure of email address verification).
  When the connection to the SMTP server failed, we try to connect to the next server by priority.
  If the 'Analyze all MX records' option was selected, the system will check the test possibility on all MX records on the server.

The procedure of email address verification

• We connect to SMTP server.
• We check the 'HELO' command.
• We check the 'MAIL FROM' command.
• We check the 'RCPT TO' command.
• We check the 'QUIT' command.
• We rank the email address by the email rank.
• We make the email address recommendation.

Analyze all MX records

When you choose this option the email analyzing process tests the email address in all MX records of this domain. This option can add processing time.
When this option is not selected we check only one MX record with the highest priority.

Check negative response possibility

When you choose this option we generate and test random false email address (see the procedure of email verification),
and if the SMTP server returns an answer (by 'RCPTTO' command) that this email address does not exist,
we can be sure that when checking the email address that interests us we will get a true answer.
If the server returns an answer that this false email address does exist, when checking an email address that interests us, we cannot be sure that the SMTP server response will be true.
When the option 'Check negative response possibility' is not selected we cannot be sure that SMTP server returns a true answer.

Email address rank

The email address rank indicates the validity of email address. This is an aggregation data of all the tests.
This data indicates you if the email address exists or not and what exactly failed during the process of the verification.

Code	Description
0	The email address exist.
1	Invalid email address syntax.
2	The domain does not exist.
3	MX records not found.
4	The MX record is unavailable.
5	Connection failed.
6	'HELO' failed.
7	'MAILFROM' failed.
8	The email address does not exist.
9	'RCPTTO' is not clear.
10	'RCPTTO' does not support negative response.
11	'RCPTTO' email account is over quota.
12	Undefined.

Email address recommendation

The email recommendation is our interpretation of the rank given to the email address at the end of the verification process.

Description
The email address exist.
The email address does not exist.
It is impossible to make a clear decision.

Options of the response given for the email address verification

• Online Single Email Address Test

  1. On the screen

• Online Bulk Email Address Test

  1. On the screen
  2. Download excel file
  3. Download json file

• Manual Email Address Test Task

  1. Download excel file
  2. Download json file

• Api Email Address Test Task

  1. json format message sent to http provided

Data provided in our response

1. Email address syntax is valid / invalid
2. Domain name exist / does not exist
3. MX record exist / does not exist
4. If SMTP server supported negative response.
5. Connection Response
6. HELO Response
7. MAIL FROM Response
8. RCPT TO Response
9. QUIT Response
10. Email rank
11. Email address recommendation

We come to the conclusion analyzing all the data received during the test.
As we provide you this information as well, you can come to the conclusion by yourself, and your conclusion may or may not be similar to ours.