0
votes
1answer
167 views

DNS Zone Record: How to set up MX Record correctly? [closed]

I've been search for this for quite a while, and tried many different examples for weeks (because I usually have to wait a couple hours for the DNS change). Nothing made my mail() in PHP as well as my ...
-1
votes
3answers
224 views

Is blocking SMTP ports prevent server from sending emails?

I have a Centos server with cPanel on it. Yesterday, some hackers had successfully connected to my smpt server and sent thousand of emails from it. What I want to do is blocking every ports except ...
1
vote
1answer
137 views

Send email through Gmail SMTP to avoid local delivery attempts?

Background We use Google Apps for email with our domain example.com: [ec2-user@example ~]$ dig MX example.com … ;; ANSWER SECTION: example.com. 300 IN MX 1 ...
0
votes
1answer
341 views

CentOS postfix smtp server connection refused from outside

I am quite stuck with my postfix/smtp configuration on my CentOS machine. I setup a mail dns mail.domain.tld, configured in the postfix main.conf file and tested locally on the server by connecting ...
0
votes
0answers
41 views

How can I prevent Sendmail from cutting off SMTP error responses from a recipient MTA in maillog?

CentOS 5.x | SendMail 8.14 I've noticed that Sendmail will occasionally cut off SMTP error responses in logs. For example: Jan 10 05:55:55 foobox sendmail[20998]: s1CStsdli020998: ...
0
votes
1answer
272 views

Postfix smtpd not listening 'Unable to Connect to SMTP Host'

I set a postfix + cyrus-sasl + cyrus-imapd mail server on my CentOS 6.5 x64 server. After I finished the settings, I found that I can send internal emails and send emails to other mailboxes like ...
0
votes
1answer
1k views

554 5.7.1 <mail_addr>: Relay access denied centos postfix

I have problem in send mail from postfix in centos I have following setup mail server postfix for sending mail but I am getting error. As in the link I tried following commands telnet localhost ...
0
votes
1answer
109 views

Using the same url for incoming (imap), and outgoing (smtp) mail [closed]

I have setup a postfix daemon and I am able to send emails to an account, and I am also able to login via a mail client and get those emails. But what I'm trying to do is use the same url, e.g: ...
1
vote
2answers
2k views

SendMail not working in CentOs 6.4

I am trying to send e-mails from my CentOS 6.4 but it does not work. My knowledge about servers is quite limited, so I hope someone can help me. Here is what I did: First i tried to send an email ...
0
votes
1answer
58 views

How soon after getting a 400-class SMTP error will SendMail try connecting to a backup MX record/host?

CentOS | Sendmail 8.14 Hi All, I couldn't find this in the batbook. If SendMail attempts to deliver an email to a primary MX record and gets a 400-class error back, how quickly does it try the ...
2
votes
1answer
419 views

Postfix + SASLAUTHD + MySQL authentication problems

I've been trying to sort this out for the past 6 hours or so, this is the error message I'm facing (Running CentOS x64): /var/log/maillog: Jun 22 20:42:49 ptroa postfix/smtpd[10130]: warning: SASL ...
0
votes
1answer
210 views

How does SendMail decide which connections are cached?

CentOS 5.x | SendMail 8.14.4 I'm trying to wrap my mind around how Connection Caching works in Sendmail. I'm experiencing some connection issues with some remote mail hosts that we communicate with ...
0
votes
0answers
106 views

How can I throttle incoming emails in SendMail for a specific recipient?

CentOS 6.3 | SendMail 8.14.4 I'd like to throttle inbound emails to a specific address via sendmail. Is that possible? Ideally I'm looking for the opposite of greylisting: Accept the first email from ...
0
votes
1answer
1k views

Postfix SMTP-relay server against Gmail on CentOS 6.4

I'm currently trying to setup an SMTP-relay server to Gmail with Postfix on a CentOS 6.4 machine, so I can send e-mails from my PHP scripts. I followed this tutorial but I get this error output when ...
0
votes
0answers
108 views

Send emails to anywhere from localhost, send emails only to local users from external

I am attempting, for the first time, to set up an email server. So far, I have postfix and dovecot running on my CentOS server (hosted at rackspace). It has 3 interfaces: localhost, internal network, ...
-1
votes
1answer
158 views

how to receive emails on linux? [closed]

Is there any small utility to receive emails on linux ? Ideally I would need to point mx records on my server and through just a command read all the emails received. I don't need pop3, imap, any user ...
0
votes
1answer
28 views

How can I collect the information sendmail sends to a milter and receives from that milter?

SendMail | CentOS For debugging/troubleshooting purposes, I'd like to examine the raw information that sendmail is sending to a local milter (and also the data being returned by a milter). Is that ...
0
votes
3answers
225 views

Do I need to setup an SMTP MTA for a contact us form on a VPS?

I'm about to setup a Linode running a Centos server with a rails apps. The rails app has a contact us form. That justs send enquirys to the site owner. No other email functionality is needed The site ...
1
vote
1answer
194 views

Is it possible to configure sendmail to require/use certain ciphers during TLS negotiation?

CentOS 5.x | SendMail I'd like sendmail to use a specific cipher when negotiating a TLS session with a specific remote MTA/domain. Is that possible? I'm aware that a minimum bit strength can be ...
0
votes
1answer
142 views

Set up a SMTP server on CentOS

I have a php script on a remote that is using PHPMailer in order to deliver mail. I have now acquired a VPS, and I want it to act as SMTP server, so that phpmailer connects to this CentOS VPS and ...
1
vote
4answers
531 views

Is it possible to include subject lines in the default sendmail maillog?

CentOS 5.8 I'd like to be able to track an email based on Subject line. The default log of 9 in SendMail doesn't appear to include that information. My questions are: What is the minimum ...
1
vote
1answer
770 views

DSN Service Unavailable

I am having trouble with a newly installed server that we have just migrated to. I am running sendmail and cannot send mail to a specific domain. Mail everywhere else appears to work. Logs say: DSN: ...
1
vote
1answer
110 views

What is the failover logic when SendMail is smarthosting to a FQDN with multiple A records?

CentOS 5.x | SendMail This is somewhat related to my other question about round robin but as it's more general, I thought I'd separate it out. If SendMail is smarthosting to a FQDN with multiple A ...
2
votes
2answers
2k views

Problems opening port 465 for smtp on centos

I'm using phpMailer to send off purchase confirmations using a google apps address/smtp. The whole thing was working great on the development box, but now that it's live, it seems that the port I'm ...
0
votes
2answers
108 views

How do I block most emails from being sent to a specific email address (unless they're on a whitelist)

CentOS 5.x | SendMail I want to block most emails going to a specific sendmail mailbox unless they are on an approved "whitelist". Is this possible to do in sendmail?
2
votes
1answer
497 views

Does snmpd support SNMP monitoring of SendMail queues?

CentOS 5.7 | SendMail 8.14.x I've got a CentOS box running snmpd and I'd like to monitor sendmail queues. Is this natively supported by snmpd or will I need to do something special to monitor it?
0
votes
2answers
377 views

What does load average statement mean in sendmail log? Current LA? Or Threshold?

In sendmail logs, I'm seeing events like: Mar 20 08:36:05 foo sendmail_daemon_foo[1234]: rejecting connections on daemon MTA: load average: 50 Does this mean that the connection was rejected ...
0
votes
2answers
1k views

Does SendMail Support Outbound TLS Encryption WITHOUT additions to the sendmail.mc file?

CentOS 5.x Does SendMail support opportunistic TLS "out of the box"? I'm used to having to explicitly add the following blurb to /etc/mail/sendmail.mc define(`confAUTH_MECHANISMS’, `LOGIN ...
1
vote
2answers
892 views

Receiving emails on CentOS 5, Postfix

Here's the problem : Our server (CentOS 5, Postfix) can't receive mails, bat can send. Running tcpdump port 25 and sending an email from gmail shows that there are incoming request from gmail But ...
2
votes
2answers
3k views

Configure exim to use remote smtp with authentication

I have a dedicated server with exim on it. I also have a regular shared hosting account ("sharedhostingdomain.com") on hostgator. I want to configure exim to always use hostgator's smtp server ...
1
vote
1answer
193 views

How can I configure PostFix out from our DMZ?

I'd like to configure some websites in our DMZ to be able to send emails out through PostFix to the public internet without having to pass anything to our Exchange 2010 inside our private network. ...
1
vote
1answer
191 views

Qmail with AUTH CRAM-MD5

My Qmail install on Centos5 has CRAM-MD5 installed. I want to use this to an authenticated SMTP relay. Where do I specify the username and password details for QMail?
2
votes
2answers
466 views

Is there a way to completely disable outbound opportunistic TLS support in SendMail?

CentOS 5.x SendMail 8.14.4 An overzealous network security feature is causing TLS negotiations to fail when my Sendmail server tries to talk to external hosts. This is causing sendmail to constantly ...
0
votes
1answer
208 views

Can't email internally using Postfix

I've just setup a mail server on a CentOS dedicated server. I can successfully send email and receive email, using TLS and everything, so that part is perfect. The problem, however, is that I can't ...
1
vote
2answers
657 views

Why Is There A Delay In The SendMail SMTP Banner Greeting When Primary DNS Server Is Unavailable?

CentOS 5.x / SendMail Hi All, Normally when I connect to my SendMail server, I see the SMTP banner greeting almost instantly. I've noticed though, that when the primary DNS server is unavailable ...
1
vote
1answer
514 views

Relay/forward only mail that originates from specific domain using postfix

I have 2 postfix servers (lets say mail.aaa.tld and mail.bbb.tld) that acts as a relays for several domains (lets say x.com, y.com, z.com) that are composed at ccc.tld. SMTP server at ccc.tld can ...
1
vote
2answers
3k views

Postfix: send all bounce messages to postmaster

The situation is that we have a number of guests, say 80, sending through a central mail infrastructure out to the web. The way the network is setup the mail server cannot necessarily initiate ...
0
votes
2answers
447 views

Postfix timing out when trying to send mail

I just installed Dovecot and Postfix on a CentOS VPS I have, and am now trying to get it to work. Receiving mail works fine, as does fetching the mailbox with Thunderbird on Windows (using SASL for ...
0
votes
1answer
115 views

Postfix SMTP server rejects password for outgoing only

I've had postfix working on my server for a while now and have sent emails out from it, my server recently crashed and everything came back fine except I can't send emails anymore, it says the server ...
1
vote
1answer
1k views

How to “add” or “install” plugins for cyrus-sasl?

I'm working with CentOS 5.5 on a VPS, building a website. All what I want now is just to send mail to users. I decided to do this with postfix and smtp.gmail.com I had a trouble when setting up ...
2
votes
1answer
2k views

How to change sendmail fallback behavior if TLS handshake fails?

I have a CentOS 5.x server running sendmail that is failing to negotiate TLS with SOME various recipient servers. I'm looking into it. In the meantime though, I've noticed that sendmail will NOT ...
0
votes
1answer
117 views

Trouble getting smtp working on centos

I've recently setup postfix on my server, I'm receiving mail from localhost but not from the outside nor can I send, doing a port scan says that there is nothing listening on port 25 and I've checked ...
0
votes
2answers
3k views

SMTP server for centOS, other than Postfix?

I need to install smtp server on centOS, but I don't want to use postfix. please suggest some others smtp servers and how install using putty.
2
votes
5answers
754 views

Failed PCI Compliance - The remote SMTP server is vulnerable to a buffer overflow

Hey guys, I have tried allowing the scanners IP to be accepted through IPTABLES into the SMTP port, but the scan still fails. This is the error: The remote SMTP server is vulnerable to a buffer ...
2
votes
2answers
1k views

Postfix restrict which users can send out without authentication

Possibly a simple question but I'm trying to lockdown which users can send email from the local machine. I've locked down which ones can receive by running newaliases on an ...
0
votes
3answers
4k views

Postfix & TLS is configured correctly, but Thunderbird throws cryptic errors when trying to send email via SMTP & STARTTLS?

I've just recently installed CentOS 5.5 and Postfix for the first time ever. I've followed 2 different tutorials which are supposed to enable TLS on the SMTP server. Both of which told me to create a ...
0
votes
1answer
274 views

Sendmail - use custom port for specific domains

CentOS 5.x | SendMail Hi, I need to route email for specific domains to a custom port on a downstream server. Is there an easy way of doing this? I came across various instructions describing how ...
3
votes
2answers
1k views

Simple SMTP server which can redirect all mail to single address?

We're in the process of setting up a continuous-integration server (Hudson running on CentOS5), and some of our unit tests will cause email to be sent. We'd like to configure the server so that all ...
0
votes
4answers
12k views

How to open port 25 on the server

I'm using centOS. I want to implement a smtp mail server, and I have installed postfix and dovecot(both have been set correctly). I tried to telnet the 25 port, but it returns Unable to connect to ...
2
votes
2answers
443 views

How to change default sendmail SMTP error codes, responses, and/or DSN text?

CentOS 5.x - SendMail Hi Guys, I'm curious -- is there any way to customize the STMP error codes, response text, and/or DSN body text in sendmail? If so, where is this stored? Thanks, Mike