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Dear Experts<br />
<br />
We are having zimbra mail server zcs-professional edition for our email services, as policy for years we were using our company logo which is in jpg image under the signature of email body when we compose this automatically remain, for last 2 days it is observed mails to the same account if send OR mails to the same domain OR mails to the external domains with this logo are not delivered, I could understand by log files these mails were discarded , posted below the /var/log/mail.log<br />
Dec 18 01:44:08 mail postfix/smtp[30884]: 0E56B8E030F: to=&lt;ind@mydomain.com&gt;, relay=127.0.0.1[127.0.0.1]<wbr />:10032, delay=8.1, delays=0.3/0.03/0.01/7.8, dsn=2.7.0, status=sent (250 2.7.0 Ok, discarded, id=27314-03 - spam)<br />
1.Now that i am afraid on when this started to stop delivering and if not delivered then what happened undelivered ones and how to find and resend please suggest<br />
<br />
2. if we have to keep our logo in the mail body in the signature section please suggest which format would be the best practice so that our mails will not get into spams or etc<br />
<br />
Thanks in advance, please help to troubleshoot also best practice company logo format in the email signature section
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Dear Experts

We are having zimbra mail server zcs-professional edition for our email services, as policy for years we were using our company logo which is in jpg image under the signature of email body when we compose this automatically remain, for last 2 days it is observed mails to the same account if send OR mails to the same domain OR mails to the external domains with this logo are not delivered, I could understand by log files these mails were discarded , posted below the /var/log/mail.log
Dec 18 01:44:08 mail postfix/smtp[30884]: 0E56B8E030F: to=<ind@mydomain.com>, relay=127.0.0.1[127.0.0.1]:10032, delay=8.1, delays=0.3/0.03/0.01/7.8, dsn=2.7.0, status=sent (250 2.7.0 Ok, discarded, id=27314-03 - spam)
1.Now that i am afraid on when this started to stop delivering and if not delivered then what happened undelivered ones and how to find and resend please suggest

2. if we have to keep our logo in the mail body in the signature section please suggest which format would be the best practice so that our mails will not get into spams or etc

Thanks in advance, please help to troubleshoot also best practice company logo format in the email signature section

company logo jpg image under the signature in the email

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.

Email Servers

Various techniques are used to prevent email spam (unsolicited bulk email). No technique is a complete solution to the spam problem, and each has trade-offs between incorrectly rejecting legitimate email (false positives) vs. not rejecting all spam (false negatives) - and the associated costs in time and effort. Anti-spam techniques can be broken into four broad categories: those that require actions by individuals, those that can be automated by email administrators, those that can be automated by email senders and those employed by researchers and law enforcement officials.

AntiSpam

Interactions between email servers and clients are governed by email protocols. The three most common email protocols are POP, IMAP and MAPI. Most email software operates under one of these (and many products support more than one).  The correct protocol must be selected, and correctly configured, if you want your email account to work.