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Is it becoming impossible to be a small mail provider?

TL/DR : Many non-international companies (NOT hotmail or gmail) use UCEPROTECT as a blacklist qualifier without realising that UCEPROTECT is a conn; requesting money from servers to be removed from ...
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Receive mail from Paypal only to paypal@domain.com

Postfix lookups may be nested, so you can first filter out the special-treatment receiving recipients, then selectively reject unexpected senders just for those. Put a per-recipient lookup into a ...
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  • 6,291
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postfix: lost connection after CONNECT/EHLO/unknown from unknown

This fix is for Redhat8 or Rocky Linux /etc/postfix/main.cf smtpd_sasl_auth_enable = yes smtpd_sasl_application_name = smtpd smtpd_relay_restrictions = permit_mynetworks,...
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installing SSL on 2 exchange servers

A special Rpc error occurs on server EX2: Cannot import certificate. A certificate with the thumbprint ............... already exists. Refer to the blog to try to resolve this issue. If it cannot ...
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installing SSL on 2 exchange servers

You should only need to renew the cert for one and then copy the cert over to the other Exchange Server and Import it into the Cert store for the second Server.
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2 votes
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Postfix bar authentication from internet

If the abused auth feature is not needed otherwise, you can configure Postfix to not expose that feature to the wider internet. This is usually done by editing your main.cf and master.cf files. First, ...
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1 vote

How Does Email Forwarding Works In Customer Support Ticketing Systems?

This type of service usually works by running a standard mail server instance, configuring it to query the list of valid customer names more or less directly from the database where new signups are ...
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  • 6,291

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