-3
votes
1answer
54 views

Setting SMTP Banner to match PTR [on hold]

I'm attempting to fix an error that I get when I run a DNS Report on my VPS. According to the report: SMTP greeting Malformed greeting or no A records found matching banner text for following ...
0
votes
2answers
23 views

Error sending emails from a mail server relay type falling into the spam folder (using postfix)

Here I show one of the emails that come to Yahoo, which are falling directly into SPAM folder. The SPF goes smoothly, the DKIM passes without problem, even DMARK passes without problem, but just keep ...
0
votes
1answer
52 views

Reverse DNS does not match SMTP Banner

We are using postfix on centos as a mail server to send out newsletters. but in the mail log file I can see that many receivers rejected our newsletters. and with the help of mxtoolbox, I found a ...
3
votes
1answer
99 views

Outlook.com DNS so slow, postfix times out

I'm trying to send e-mails to for example: postmaster@grassvalley.com and postmaster@jorssen.net.bmw.be. In both cases these are Outlook mailboxes. Postfix replies with: (when ipv6 enabled): ...
0
votes
1answer
70 views

Send mail from local web server to ouside mail server

I've tried the search and read and tried quite a few articles by now and still no luck, so I'm hoping someone can help me here. My situation is: I'm running a web server in our local network that is ...
0
votes
1answer
129 views

What should be my MX records for postfix configuration like for mail forwarding?

I have a Digital Ocean VPS, at which I installed postfix. I want to do mail forwarding. When I installed postfix I picked No configuration option. Later I set up the following: I created main.cf at ...
0
votes
1answer
545 views

Postfix/smtpd: Client host rejected: cannot find your hostname

I'm trying to set-up a mail server, using postfix and dovecot. Everything works fine, and I can connect in IMAP using Mozilla Thunderbird. But when I'm trying to send emails using the smtp server, I ...
1
vote
2answers
39 views

Postfix sending and receiving in strange way.

I have an email server, running on CentOS 6.5, 32bit system, with Postfix and Dovecot running along all their dependencies. Let's assume my domain is www.anw.com I have created A record in this ...
0
votes
1answer
77 views

Mail Server with different IP than Web Server [closed]

I recently had a problem. Somebody hacked a Wordpress Site of one of my customers and sent about 70.000 Spam Emails. So my Server IP got blacklisted on some Providers. I'm looking now for a solution ...
1
vote
2answers
153 views

501 HELO no reverse dns name

I have a dedicated server with a public ip running postfix with multiple domains. The emails are coming in all right but when I try to send mails from this machine they often get bounced back by ...
0
votes
1answer
33 views

How to DNS emails to vhosted domain to separate server than website

I apologize if this is a duplicate, but I'm not sure of the correct phrases to search to ensure this hasn't been solved yet. I have 2 servers, with PTR records of domain.com and mail.domain.com. The ...
0
votes
0answers
25 views

configure postfix to work with domain name which is pointing cloud based windows server

Is that possible to setup postfix mail server in my system(ubuntu server) with the details I have domain name e.g: testdomain.in testdomain.in is pointing to xxx.xxx.xxx.xxx(our cloud based windows ...
16
votes
5answers
382 views

Is it good practice or too draconian to reject mails from mailservers with no RDNS

I've recently dropped SpamAssassin and am now basing spam rejection on DNSRBL's, grey-listing and other basic tests and I'm wondering whether I should also block hosts that don't have a valid RDNS ...
1
vote
1answer
84 views

Foward mail to different domains using Postfix - all domains hosted on same server - external email hosting

I have one server hosting several domains - one main domain and several alias domains. Domains main.com alias1.com alias2.com I use the domain name registra's (Gandi.net) email service for the ...
0
votes
1answer
105 views

postfix doesn't work after iptables set up

here's my problem: # iptables -P INPUT DROP # host -t mx gmail.com ;; connection timed out; no servers could be reached # iptables -P INPUT ACCEPT # host -t mx gmail.com gmail.com mail is handled by ...
2
votes
2answers
83 views

Postfix - receive mails in user account

I have successfully installed and configured postfix mail server, and I can now send mail from my user account mail to another email on the net, through Gmail. What I want to achieve: is to send ...
1
vote
1answer
640 views

Postfix: “hostname x does not resolve to address y” warning even though it does

Postfix log shows lots of these: warning: hostname client.lab.lan does not resolve to address 192.168.1.153 Yet a DNS lookup from the server shows that it does resolve: # nslookup client.lab.lan ...
2
votes
1answer
110 views

Are these nameservers configured properly?

I'm caught in a technical war between two companies. One is a major email hosting organization. The second is a DNS provider called DNSMadeEasy. The problem: An email from an outside domain to a ...
1
vote
1answer
440 views

Postfix does not deliver to domains with only an “A” record

We have a very strange situation I don't quite understand. Our postfix server mostly delivers email just fine, but for a number of domains, there is an issue. Those domains are peculiar, as they only ...
0
votes
0answers
167 views

Users can't send mail message - mx record for site getting Truncated, retrying in TCP mode

System setup: Linux Red Hat Enterprise Linux ES release 4 (Nahant Update 9), Postfix mail server I have a user who is trying to send an e-mail. E-Mail on this server has been working for years ...
0
votes
1answer
317 views

Mail server, binding postfix to an IP address, network unreachable

I configured a DNS service using bind. It works and I created a domain named test.com . The problem is not in how I configured bind, I already have a positive feedback: I tested it using dig, which ...
3
votes
1answer
101 views

Avoiding non-existent domain point to my country's Network Information Center?

I have received an alerting email about the Mailqueue length from the Nagios: Additional Info: WARN - Mailqueue length is 18 (More than threshold: 10) In the mailq, I see some messages like this: ...
0
votes
1answer
197 views

( status=deferred :25: Connection timed out ) issue with Postfix

I have postfix installed on a Centos server with 1 main ip 1.1.1.1 and a range of ips 2.2.2.0/24 The problem is : i can only send mail with the main ip 1.1.1.1, when i change it to another one from ...
1
vote
1answer
53 views

Postfix sending emails via multiple broadband lines

I have a site that send out emails from a postfix server. They have multiple broadband lines for load balancing and failover. I want them to be able to send out emails though both lines without the ...
-2
votes
2answers
51 views

Second mail server for my domain [closed]

I have to setup a mail server because my hosting account don't allow me to send over 250 mail/hour. I have a HP microserver at home and I want to use it to send the mails. I configured Virtualmin on ...
1
vote
2answers
349 views

How to force postfix to use ip that is configured for domain?

I want to confirm to SPF and DKIM, this requires me to send email using the IP written in the DNS record of the domain I have two domains example1.com and example2.com with two IPs 100.0.0.1 and ...
2
votes
1answer
970 views

Having trouble interpreting mail log DNS errors

I have a postfix mail server on Debian. A client of mine just informed me that they were unable to send an email to me and it appears that there is a problem with their mail server. I would like to ...
6
votes
2answers
941 views

What are the correct SPF records to allow both local and Google Apps delivery

We have recently moved our server stack to a new data farm, and some of our clients are experiencing issues with mail being sent from their GApps accounts. Before the server move we had no issues, but ...
2
votes
1answer
8k views

451 #4.1.8 Domain of sender address does not resolve

When sending out email to xxx@terremark.com through my own SMTP server (mail.sarit.be), the receiving mail server replies with: 451 #4.1.8 Domain of sender address <xxx@sarit.be> does not ...
0
votes
2answers
2k views

How to prevent DNS lookups when service already disabled DNS lookups?

My enterprise recently deployed a DNS capability to all systems within the enterprise. Due to a fluke asynchronous routing error for some of our servers, we have discovered that even when a service ...
2
votes
2answers
208 views

MX record for one domain so that other domain can send with the same from

I have two domains: d1.tld and d2.tld. I would like to send emails from d2.tld with the mail from user@d1.tld How should I set my MX record so that receiving mail servers will accept the message? ...
2
votes
1answer
7k views

Domain of sender address does not resolve (in reply to MAIL FROM command)

When sending out emails with postfix I sometimes get this error: 451 #4.1.8 Domain of sender address <user@mydomain.tld> does not resolve (in reply to MAIL FROM command) The domain ...
0
votes
2answers
864 views

Connection Timed Out - Simple outbound Postfix for PHP Contact form

Alright, so I only got Postfix for a PHP contact form that will send email to a single . I only want it to send out mail to a single external address (foo@example.com). I have domain ...
2
votes
2answers
390 views

VPS with Debian Squeeze cannot forwward email - Name service error for name=gmail.com type=MX: Host not found, try again

I have postfix set-up on my Debian VPS, I can: send emails receive emails on my server But forwarding emails from my server to gmail does not work! I configured google's DNS through ...
-1
votes
1answer
761 views

cannot receive email: DNS issue or Postfix bad configuration?

I've recently change the hosting for my site and one of the things I had to do was to move the email server (update DNS with new IP and MX records ...) I am using Postfix + Dovecot on CentOS 5.8. The ...
4
votes
3answers
815 views

Excessive Outbound DNS Traffic

I have a VPS system which I have had for 3 years on one host without issue. Recently, the host started sending an extreme amount of outbound DNS traffic to 31.193.132.138. Due to the way that Linode ...
0
votes
1answer
87 views

External address for a single server

In a few tutorials ive read on how to make a mail server say i need a FQDN for postfix and an exact external address to my mail server for DNS records. I am hosting 4 domain names and have one server ...
1
vote
2answers
372 views

Apparently my SMTPD Greeting is Wrong

Using several different "DNS health tests" today, I've had two report that the SMTPD greeting is wrong/mis-configured. For example, the test at http://www.dnsqueries.com says I fail this specific ...
0
votes
1answer
145 views

Postfix Conditional MX Forwarding

So here's the problem. "Someguy" wants to transfer his domain and website to me so I can take care of it. But Someguy's primary email address is "someguy@thatsite.com". If he transfers thatsite.com's ...
0
votes
1answer
56 views

Disable Per client DNS Lookup

Is there a way to configure postfix to disable_dns_lookups per connecting/trusted client? Edit I have an application server that I trust, which is sending me email. It sets the From, as a customer's ...
0
votes
2answers
271 views

Will ISPs accept mail from a postfix null client with no dns record

I am concerned my mail server setup may cause some ISPs to reject mail that is sent by it. I am using Postfix to send mail for a web application, light load, user notices. It also sends cron notices ...
1
vote
2answers
508 views

ec2 postfix emails appearing as spam even with reverse dns setup?

My IP has been unblocked with Amazon and reverse DNS is in place. When I send out email via postfix through my EC2 server sometimes the emails are marked as spam and sometimes not. What could be ...
1
vote
3answers
1k views

Configure postfix to lookup MX records on remote dns for local delivery

Is there any way to configure Postfix in the way that it would check mx record before local delivery. For example - there is hosting platform, client added google.com domain. From now on he is able ...
0
votes
1answer
2k views

Postfix reject emails due to reverse DNS lookup failure when manual lookup works fine

I have bumped into the following in my mail.log file: May 20 21:50:46 degas postfix/smtpd[1596]: NOQUEUE: reject: RCPT from unknown[109.170.250.177]: 450 4.7.1 Client host rejected: cannot find your ...
2
votes
3answers
2k views

How to set SPF record?

I have configured postfix to use mail.example.com I have many virtual domains, like: domain1.com domain2.com domain3.com My question is, how to set the SPF? Do I have to set SPF for each domain ...
0
votes
4answers
140 views

Do you need to have your own DNS in order to receive mail on a VPS?

I am wondering if I need my own DNS in order to receive emails on my Ubuntu VPS? I am currently using name.com's DNS with my domain and pointing it with A records to my server, and that works for ...
0
votes
1answer
249 views

E-mail -sometimes- delivered, and sometimes Relay access denied

I want to host my own (postfix) mailserver for my domain "mydomain.com". For the unlikely event that my server is down, I would like to have gmail.com receive all mail and forward it to my domain. ...
0
votes
1answer
412 views

Email being bounced if email recipient domain name == local domain

I have a website where the domain uses an external mail server (defined by mail.mydomain.com and the MX record). An example email address is johndoe@mydomain.com. Whenever the server sends a ...
2
votes
2answers
783 views

“hostname given in the SMTP greeting MUST have an A record pointing back to the same server.”

I get this error when checking my DNS with an external tool: Spam recognition software and RFC821 4.3 (also RFC2821 4.3.1) state that the hostname given in the SMTP greeting MUST have an A ...
0
votes
1answer
456 views

postfix concurrency limit with round robin dns

Take the following internal round robin dns setup mymta.com. IN A 172.31.1.1 mymta.com. IN A 172.31.1.2 mymta.com. IN A 172.31.1.3 mymta.com. IN A 172.31.1.4 mymta.com. IN A 172.31.1.5 mymta.com. IN ...