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emails can be sent without any restrictions on the number of emails
you will not need to use third-party services, and therefore pay for them
Disadvantages:
implies a constant adjustment of settings, since mail services regularly change the rules for sending emails
does not exclude the possibility of emails getting into spampaid service
2.OPTIONAL: Improve domain name and network settings to get better delivery from localhost
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more reliable delivery of emails
regular monitorinf of changes in the rules for delivering bulk messages
provide an interface to simplify setup
Disadvantages:
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implies a constant adjustment of settings, since mail services regularly change the rules for sending emails
does not exclude the possibility of emails getting into spam
Case 2) If you see Relay Access Denied in maillogs and there are no emails delivered make sure to whitelist 127.0.0.1 in mailserver settings at Plesk
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