The problem is solved!!!!
In the library "src/lib-sieve/plugins/vacation/cmd-vacation.c", in the
package "dovecot-sieve" or "dovecot-pigeonhole" modify:
smtp_handle = sieve_smtp_open(senv, reply_to, NULL, &f);
smtp_handle = sieve_smtp_open(senv, reply_to, reply_from, &f);
You can check the correct operation in your logs.
/var/log/maillog
postfix/smtpd[27112]: connect from smtp.mydomain.com
postfix/smtpd[27112]: A95D2168456: client=smtp.mydomain.com
postfix/cleanup[27114]: A95D2168456:
message-id=<a5bbc98aaf65424cadbfb6acf0003e8b03fb4...@example.com>
postfix/smtpd[27112]: disconnect from smtp.mydomain.com
postfix/qmgr[17010]: A95D2168456: from=<asier.ci...@example.com>,
size=7274, nrcpt=1 (queue active)
postfix/pipe[27115]: A95D2168456: to=<asier.ci...@mydomain.com>,
relay=dovecot, delay=0.09, delays=0.01/0/0/0.08, dsn=2.0.0,
status=sent (delivered via dovecot service)
postfix/qmgr[17010]: A95D2168456: removed
/var/log/dovecot.log
dovecot: auth(default): master out: USER 1 asier.ci...@mydomain.com
uid=xxx gid=xxx quota_rule=*:bytes=524288000 home=/buzon/asier.cidon
dovecot: deliver(asier.ci...@mydomain.com): sieve:
msgid=<a5bbc98aaf65424cadbfb6acf0003e8b03fb4...@example.com>: sent
vacation response to <asier.ci...@example.com>
dovecot: deliver(asier.ci...@mydomain.com): sieve:
msgid=<a5bbc98aaf65424cadbfb6acf0003e8b03fb4...@example.com>: stored
mail into mailbox 'INBOX'
/var/log/maillog
postfix/pickup[17009]: B221D168458: uid=xxx from=<asier.ci...@mydomain.com>
postfix/cleanup[27114]: B221D168458:
message-id=<dovecot-sieve-1344420404-70376...@mda.mydomain.com>
postfix/qmgr[17010]: B221D168458: from=<asier.ci...@mydomain.com>,
size=661, nrcpt=1 (queue active)
postfix/smtp[27195]: B221D168458: to=<asier.ci...@example.com>,
relay=smtpinterno.mydomain.com, delay=0.04, delays=0.01/0/0.01/0.01,
dsn=2.0.0, status=sent (250 2.0.0 Ok: queued as A3A092280B3)
postfix/qmgr[17010]: B221D168458: removed
