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The 550 and 553 error codes should all be treated the same by the sending server as will any of the 500 series codes. These all indicate a permanent error condition. The 550 indicates the requested action (add recipient) was not completed. The 553 error indicates that the mailbox name is invalid. In either case the recipient was not accepted.


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Out of the box, I don't think SendMail has the ability to natively block messages containing specific attachment name/type patterns. For something like this, you'd need to leverage a sendmail milter (for which there are many). Which milter is right for you depends on your requirements, preferences, infrastructure, and business use case so unfortunately I ...


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In my earlier comment, I was wrong about transport_destination_rate_delay behaviour. You can set amount of delay that is inserted between individual deliveries to the same destination via transport_destination_rate_delay The meaning of "same destination" here is same domain/nexthop if transport_destination_rate_delay > 1 same recipient if ...


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I'm guessing that mail for example.com needs to be forwarded to the "real" mail server for that domain, or perhaps all mail should be forwarded to a "smart host". I don't know how the default exim package for Centos is configured (if there is such a thing)... You should make the config available somewhere so I can say exactly what needs to be changed. ...


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Here are some details on how to setup sendmail for Outgoing Only Also on this page I modified these steps from what is listed on the website for centos/Amazon Linux. Here are the steps: you may also need to install sendmail-cf # yum install sendmail-cf # cd /etc/mail # nano local-host-names add new line: localhost save the file and quit the editor # ...


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Look at the headers of the delayed email. The Received: headers will show where you are being blocked. It is likely the emails are being delayed by a spam/virus filter somewhere along the path. The headers may indicate where the scanning is occurring as well as providing scan results.


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This is very difficult, if not impossible to troubleshoot. Without access to their mail server logs you can only assume what's the issue. Have you tried sending the email to different domains? Maybe it's the receiving end that causes the issues? Keep in mind that your mail reading application chooses how to display HTML mails. I just haven't run into a ...


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Sendmail won't know which host the client connected to. You'll need to lookup the hostname and use it in creating your addresses. Sendmail will send from one IP address. This is normal behavior, and you are unlikely to be penalized by recipient's servers because of this. However, if you do generate spam and get blacklisted all traffic will be penalized. ...


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Most email services have a built-in blind carbon copy (BCC:) function. Using this function will cause the server to make a duplicate of the email and send it to the address that is specified; the regular message continues to be delivered to the user. I haven't touched sendmail in years, but I know for certain that postfix has this feature. It took some ...


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Sendmail expects the email address to be the last thing in the command line. If you have any parameters after the email address, it will parse them as email addresses. In the example above, it's trying to parse "-c" as an email address and giving an unrelated error. # BAD $ echo test | mail to@example.com -s "test" # BAD $ echo test | mail to@example.com -c ...


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The problem is that the default sendmail configuration is to only listen on localhost, not external interfaces, you will need to reconfigure Sendmail to allow this. You will need to install sendmail-cf: sudo yum install sendmail-cf Then, edit your DAEMON_OPTIONS: cd /etc/mail sudo vi sendmail.mc Look for the entry: ...


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I believe your binding is where you need to look at, desirable output should be: # netstat -an | egrep '\:25.*LISTEN' tcp 0 0 0.0.0.0:25 0.0.0.0:* LISTEN tcp 0 0 :::25 :::* LISTEN # As in your case if you disable firewall all together, you ...


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Sendmail being on the server doesn't necessarily mean it will be used to send mail by the outside world. Some services may rely on it to send mail to local users as alerts. Three options: Make sure sendmail only listens on localhost Disable it in your init system (which you haven't told us what version of Debian you're running so this is left as an ...


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To manually flush the queue in clientmqueue: sendmail -Ac -q -v Or without -v if you don't want to watch the progress in the console: sendmail -Ac -q


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The problem is that your SMART_HOST doesn't trust your server to send mail from an arbitrary sender to an arbitrary recipient, and thinks you're a common-or-garden relayer, so denies you. Either you control ssrs.reachmail.net, in which case you need to tell it that your server is authorized to send mail by listing its IP address in (eg) /etc/mail/access and ...


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Transfer solution from question to answer section. For anyone who has this problem and can't figure it out, I found the root cause and solution. I couldn't prevent the client certificate from getting sent to Microsoft so my only option was to find out why Microsoft was rejecting the server. When creating the certificate we were using a different server ...


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It may take more than one step to fix this issue Take the step mentioned earlier. Log into your google email account and then go to this link: https://www.google.com/settings/security/lesssecureapps and set "Access for less secure apps" to ON. Test to see if your issue is resolved. If it isn't resolved, as it wasn't for me, continue to Step #2. Go to ...


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Snippet from comment It is a CentOS 5.11 server, there is no newer postfix version available in our repos (CentOS standard repos, epel, FAN, graphviz and remi). So you are stuck in unsupported version of postfix 2.3.3. Well, I understand your case, it's very sad tough :(. Postfix version 2.3.3 was released in August 2006. Although the CentOS team was ...


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My understanding is that Google Apps is not for transactional mail, but I could be wrong. What may work better is a smart relay that makes use of an API, as this is typically lighter on resources than using a local MTA. Mandrill by Mailchimp is popular, but there is also Amazon SES, Rackspace Mailgun, and others. You can find WordPress plugins for these and ...



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