I just upgraded to version 8 sendmail and suddenly connections to the SMTP port take a long time. What is going wrong?
It’s probably something weird in your TCP implementation that makes the IDENT code act oddly. On most systems version 8 sendmail tries to do a “callback” to the connecting host to get a validated user name (see RFC 1413 for detail). If the connecting host does not support such a service it will normally fail quickly with “Connection refused”, but certain kinds of packet filters and certain TCP implementations just time out. To test this (pre-8.7.
It’s probably something weird in your TCP implementation that makes the IDENT code act oddly. On most systems version 8 sendmail tries to do a “callback” to the connecting host to get a validated user name (see RFC 1413 for detail). If the connecting host does not support such a service it will normally fail quickly with “Connection refused”, but certain kinds of packet filters and certain TCP implementations just time out.
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