You use a blackhole list service that blacklists a few sites with which you must communicate. You need to configure sendmail to override the blackhole list for specific addresses.

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Create a minimal sendmail configuration containing only an OSTYPE statement to specify the correct operating system and a FEATURE command to select the nullclient feature:

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Add the redirect feature to the sendmail configuration using the following FEATURE command:

dnl Notify senders about discontinued addresses  FEATURE(`redirect')

Rebuild the sendmail.cf file, copy the new sendmail.cf file to /etc/mail, and restart sendmail

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Add an entry to the aliases text file for each mailing list, where the alias field contains the name of the mailing list, and the recipient field contains a comma-separated list of all of the recipients of the mailing list.

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Add an alias to the aliases file for each user whose mail must be forwarded to another system. The recipient field of the alias entry must be a full email address that includes the host part.

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