Read Timeouts

The Or option in the configuration file sets the read timeout. The default read timeout is Or15m. Although it is technically unacceptable within the published protocols, sendmail might time out when reading the standard input or when reading from a remote SMTP server. If your site has problems with read timeouts, set the read timeout to a larger value, like one hour (Or1h), to reduce the chance of several idle daemons piling up on your system.