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Thanks everybody, I did not setup a reverse DNS I see the option in my VPS provider but I don't know how to do it and I thought was not necessary because worked well with a lot of mail domains, this is my domain carindustry.com.ar I placed the DNS records in namecheap.com, what should I put in the reverse DNS??


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I'd like to provide a better answer, but without knowing how you're doing DNS (for example, using godaddy or someone) I can't say exactly how it's done, but I can say that you need to configure DNS with forward and reverse pointers for your domain and IP address. See here and read through Step 1: DNS Setup. You may be lacking the PTR record for your ...


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Your e-mail server is trying to connect to gmail over IPv6. According to the error message, you have no PTR record for IPv6 pointing to your server. If you can create PTR records yourself, you should do that. If you can't, you'll have to ask your server provider. An example PTR record is this: ...


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This solved me on the same issue. service sendmail stop service postfix restart service sendmail start As seen at Postfix start error Port 25: Address already in use


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How did you get your list of 300K addresses? If you did it correctly, there are certainly companies who will let you do this. Did you have people sign up to be on this list? If so, then a lot of hosting companies would be fine with you sending lots of mail out to reach everyone on your list. Mailchimp is one that comes to mind. Additionally, most network ...


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I just ran into what may be the same problem on Ubuntu 14.04.4 after applying an update. A working dovecot configuration started getting failures on all authentication requests. The fix that worked for me was in /etc/dovecot/conf.d/10-master.conf. Uncomment this line: #default_vsz_limit = 256M and raise the limit. I set it to: default_vsz_limit = 512M ...


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Ohh my bad. My receiving address has blocked this email and that's why it is not working.


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According to https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=758660 saslauthd stops functioning after some amount of logins (successful and/or failed). You don't need to restart the whole server, the following is enough: service saslauthd restart You can put that into a crontab. If a lot of logins originate from the same, malicious IP you can drop ...


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From the UFW MAN Page By default, ufw will apply rules to all available interfaces. To limit this, specify DIRECTION on INTERFACE, where DIRECTION is one of in or out (interface aliases are not supported). For example, to allow all new incoming http connections on eth0, use: Example : ufw allow in on eth0:0 to any port 80 proto tcp ...


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You have a couple different options, though all will rely on your ability to program each. Depending on the type of data collected, it would seem to me to most likely be best saved to a database. Which having LAMP, you have mysql installed. There are many sites that will show you examples of php/mysql. For security reasons you should ignore any tutorial ...


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What you want to do is not possible. You need an open port 25. Port 587 is the "submission" port, it is used only by end-users wishing to send e-mail through an external SMTP server. After that, when two servers are communicating with each other to transmit a message to its destination, only port 25 is used.



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