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Many
ISP mail servers also reduce the number of concurrent connection--meaning
that even thought your ISPs mail server have accepted all your emails--they may
not be delivered or accepted by the intended recipient ISPs mail server.
See:
Server-time-out disconnected
Many ISP's mail
servers are known to block or barred a sender email domain because they have repeatedly sent emails to non-existing account holders within their
domain. Because spammers are known to use
software that generate random email addresses for spamming and don't bother to
remove bounced or undelivered mails, hence, ISPs assumed that the sender is
trying to spam.
If you are broadcasting emails using your own
computer mail server program?
Emails will first be sent from MailsBroadcast
to your mail server program for delivery and if you are
off-line (not connected to the Internet) your mail server will cache or
store them in queue until the next delivery
scheduled.
Next...
Your mail
server sent-out emails--one by one--single thread or dozens
at a time using multi-threads program--directly to the email recipient ISP mail
server. Any undeliverable email will remain in your mail server cache for
repeated delivery--depending on your settings.
| MailsBroadcast send emails continuously in groups of 10 (default
setting) or up to 250 emails per group to your ISP mail server or to your PCs mail server for distribution--as
fast as your ISP or mail server can cache them for distribution. Therefore,
the speed of sending emails is not due to the MailsBroadcast program. See
Email Speed |
All emails
being sent-out from your own mail server will still be subjected to the same
SMTP protocol conditions for acceptance or rejection by the recipient ISP mail
server.
See:
Server-time-out disconnected and identifying
(soft or hard) Permanent failures
SMTP
Return Error Codes
Once,
mails are accepted
by the recipients ISPs mail server (unless the sender email domain have been
blocked and mails are delete without notification) it is considered delivered
– it means that if you are sending mails from your own mail server are either
undeliverable or delivered.
Summary
Broadcasting emails through your ISP mail server
Bounced or undeliverable emails will be slower to be returned and you
will most likely be restricted by time or quantity of emails allowed to be sent to
both your recipients and ISPs' mail
server.
Broadcasting emails via
your own mail server
Bounced or undeliverable emails data will be available at your own
mail server and you are not restricted in any way by time or quantity of
emails sent.
Undeliverable email
addresses from recommended mail server program, can be automatically transferred
to MailsBroadcast bounced folder for "Global" removal from the entire database
or clean each individual email list folder.
Which ever method being used to broadcast emails
They are subject to the
basic core process
of the five SMTP email transaction
commands protocol for acceptance or rejection of emails by the recipient ISP
mail server.
And that,
bounced or undeliverable emails does not necessarily means that the recipients
are invalid.
See
rfc2821 for the
basic specification of SMTP
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