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Registration |
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Email addresses verification
 Several types of e-mail
addresses checkup can be performed. The number of checkup methods
used affects checking quality and overall time of validation
process. Let us focus on each method:
Syntax checking (menu Verify / Verify
syntax)
Syntax checking consists of checking e-mail address for @ character
and for allowed characters. The allowed characters are: '-', '.',
'0'..'9', '@', 'A':'Z', '_' and 'a':'z'. This method of checkup is
the fastest with average speed of checking reaching thousands of
e-mail addresses per second. However, we recommend using it for
huge mailing lists only just to make sure there are only validly
spelled addresses in the list. Internet connection is not required
when using this method.
Domain checking (menu Verify / Verify
domains)
Domain checking is performed by connecting to DNS servers and
querying domain names of e-mail addresses (e.g. checking domain.com
for existence for kate@domain.com e-mail address). Checked domains
are marked in domains list in the following manner:
- if the domain name is invalid it is marked as  Invalid domain
- if the domain name exists but does not have MX records it is
marked as 
- if the domain name exists and has MX records it is marked as
The speed of this operation is lower than in case of Syntax
checking but way higher than in case of Complete SMTP checking.
This method is recommended for mailing lists containing hundreds of
thousands or millions of e-mail addresses. About one third of
invalid addresses are being removed on this stage of
checking.
Complete SMTP checking (menu Verify /
Verify e-mail addresses)
The complete e-mail address checkup is performed by connecting
e-mail server(s) specified in domain's MX records, returned by DNS
server during querying or directly to the domain name mail server
in case that MX records are not found. Upon connecting to server
the program tries to send mail to e-mail address being checked for
validity. If the server responds with mailbox available message the
e-mail address is marked as Valid, otherwise
as Invalid - no mailbox. The conversation to
SMTP-server is displayed on the log-panel located to the right.
Syntax checking and Domain checking methods are used prior to
Complete SMTP checking.
This type of checking gives the most realistic results, however
it takes reasonably large amount of time to complete such check.
The Complete SMTP checking method is recommended for mailing lists
with no more than a hundred thousands of e-mail addresses. About
two thirds of invalid addresses are being removed on this stage of
checking.
See also:
 Save results of verification
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