我在 gmail 帐户中发送电子邮件时遇到问题。我在队列中看到他们，但他们没有处理。查看日志，我注意到当我尝试发送到 gmail 时，我收到以下信息：
Dec 5 12:55:36 lvps81-41-130-77 postfix/smtpd[8797]: connect from adsl-215.176.58.243.tellas.gr[176.58.243.215]
Dec 5 12:55:36 lvps81-41-130-77 postfix/smtpd[8797]: warning: connect to Milter service inet:127.0.0.1:12768: Connection refused
Dec 5 12:55:37 lvps81-41-130-77 postfix/smtpd[8797]: 51E6A4413: client=adsl-215.176.58.243.tellas.gr[176.58.243.215], sasl_method=DIGEST-MD5, sasl_username=donotreply@edentalbook.com
Dec 5 12:55:37 lvps81-41-130-77 postfix/cleanup[8801]: 51E6A4413: message-id=<002a01d24edd$baa3c680$2feb5380$@com>
Dec 5 12:55:37 lvps81-41-130-77 opendkim[31319]: 51E6A4413: DKIM-Signature field added (s=mail, d=edentalbook.com)
Dec 5 12:55:37 lvps81-41-130-77 postfix/qmgr[29641]: 51E6A4413: from=<donotreply@edentalbook.com>, size=2808, nrcpt=1 (queue active)
Dec 5 12:55:37 lvps81-41-130-77 postfix/qmgr[29641]: warning: connect to transport private/smtp-ipv4: No such file or directory
Dec 5 12:55:37 lvps81-41-130-77 postfix/error[8802]: 51E6A4413: to=<grnelgeo@gmail.com>, relay=none, delay=0.62, delays=0.61/0/0/0, dsn=4.3.0, status=deferred (mail transport unavailable)
Dec 5 12:55:40 lvps81-41-130-77 postfix/smtpd[8797]: disconnect from adsl-215.176.58.243.tellas.gr[176.58.243.215]