localhost log # emerge -pvt sendmail

These are the packages that would be merged, in reverse order:

Calculating dependencies... done!
[ebuild  N    ] mail-mta/sendmail-8.14.0  USE="ipv6 ldap ssl tcpd -mailwrapper -mbox -nis -sasl -sockets" 2,009 kB 
[ebuild  N    ]  mail-filter/procmail-3.22-r7  USE="-mbox (-selinux)" 222 kB 
[ebuild  N    ]   mail-mta/ssmtp-2.61-r2  USE="ipv6 ssl -mailwrapper -md5sum" 53 kB 
[blocks B     ] mail-mta/ssmtp (is blocking mail-mta/sendmail-8.14.0)
[blocks B     ] mail-mta/sendmail (is blocking mail-mta/ssmtp-2.61-r2)

Total: 3 packages (3 new, 2 blocks), Size of downloads: 2,283 kB