If you keep the retry far enough apart, the second hit could be okay,
but you will run into cases of 'over quota' and temporary failures.
Technically, hard bounces take very little overhead on the receiving
side, since the check is at SMTP layer, so unless you have a wide spread
problem, eg a large number of stripped addresses, or fake
sign-ups/mailbomb subscriptions, using three is a good number.
Suggestion?
* HARD BOUNCE (try again four (4) hours later)
* SECOND HARD BOUCE (try again 48 hours later)
* THIRD HARD BOUNCE (remove the address from ALL lists)
IMHO..
But, you SHOULD be careful as to the actual MAIL FROM being used..
Try to reflect the actual sender as much as possible (eg domain), that
makes it easier for company specific white lists to allow the messages
they want, especially when the service is a shared service.
On 2019-02-27 8:16 a.m., Marco Franceschetti via mailop wrote:
Hello,
We at contactlab are considering a change in the deactivation of hard bounces.
Currently, we suppress not existing mailboxes at the first hit.
We are aware of a small percentage of false positives.
Recent admissions criteria for Certified Senders states:
"The CSA sender must take email addresses from mailing lists, if, after sending
to this address,
the mailbox is identified as non-existent; at the latest, however, this must
occur after three hard
bounces".
We are evaluating to remove not existing mailboxes from the lists of our
clients after the second hit instead of the first one.
Do you have any considerations, suggestions about this?
Marco
Marco Franceschetti
Head of Deliverability | ContactLab
[email protected]
Via Natale Battaglia, 12 | Milano
contactlab.com/it
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