I have PostFix up and running on a CentOS box and would like to send mail from a Windows server on the same network out through the PostFix server.
When I try to telnet from the Windows server into port 25 on the PostFix server currently the connection fails.
Where do I set this up within PostFix/CentOS?
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![]() Postfix Send Mail Via RelayWindows Ninja
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2 Answers
You will need to configure relay. However when postfix is running you should be able to still connect to port 25. Might there be a firewall blocking this connection?
When you open main.cf, you can need to add this directive:
example:
do not put 0.0.0.0 or you will become an open relay.
Lucas KauffmanLucas Kauffman
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My Postfix server has something of the sort in its IPtables to enable connections.
Your server might be restricted even further, depending on what you are trying to do.But if telneting to it on port 25 fails do not expect the machine to function as an SMTP server (unless of course you change the ports - which is not what you said). Note that it is possible, many time preferable to accept connections on other ports.
ankank
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I have Postfix 2.6.6 installed on my CentOS server. I use SendGrid for all outgoing mail, and have the following settings in my Postfix main.cf file.. Download dynasty warriors 6.
This server runs a few PHP sites that generate automated emails. Usually all email generated on the server is relayed to SendGrid. However, when sending to an email address that uses the same domain as the hostname of my server, the email lands in the
root mailbox on the local server instead of being relayed to SendGrid.
For example, let's say the hostname of my server is
mydomain.com . When an email is generated on the server to be sent to [email protected] it lands in the root mailbox on the local server.
Is there any way to tell Postfix to send all email, even mail that uses the local hostname, via the SendGrid relay?
MontyMonty
1 Answer
On a shell, run the following code,
This will clear the
mydestination variable, thus no mail is considered local.
Ralf HildebrandtRalf Hildebrandt
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I have an email [email protected] which is configured to forward all emails to an gmail email address. Replying from gmail mailbox I want it to send emails from [email protected] gmail allowed this through simple setup settings -> Accounts and Import -> Add another email address you own and then option to send email with verification code to verify that I own it. But now there is available only option 'Send mail through your SMTP server' Franklin table top hockey.
I have server with postfix installed. Now postfix used only to send email that are originated from this server. iptables will not allow to connect to postfix from different PC/servers and it is now secure as nobody is able to send email through my server.
I googled a lot, but found a lot of articles how to configure postfix to send emails through smtp.gmail.com.But I need to work it vice versa - gmail should send emails through my postfix smtp server in a secure way.
Could you please help me in findings on how to accomplish this?
IndexIndex
1 Answer
SASL configuration
users must specify [email protected] as login name, not support.Unfortunately was not able to proceed with this variant, it does not workOptions without realm, it will default as revers DNS of your server
First variant when you explicitly state realm works, but second does not work. Therefore chose variant without realm
POSTFIX RELAY
Check on 25 port (587 uses TLS), my servers reveals only 587 port and 25 is blocked by iptables
test with telnet
Postfix Mail Name
In case of unexpected things look for errors here
IndexIndex
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Claire Walker | Modified: 2018-10-25T10:47:36+00:00 | Gmail|
Postfix is an open-source Mail Transfer Agent (MTA) that acts as SMTP server or client for sending or receiving emails. There are so many reasons due to which users need to configure Postfix to send mail using Gmail and Google Apps. One of the main reason is to avoid getting your email flagged as spam if the current server IP has been added to the blacklist. Therefore, in this blog, we are going to discuss a step-by-step guide on how to connect Postfix to Gmail account in Ubuntu to send email through Gmail and Google Apps.
Before Getting Started
Sequential Steps to Connect Postfix to Gmail Account
The process starts with installing of required packages to finally configuring the account in Postfix. Follow the guide in the below section for detailed instructions.
I. Install Postfix Mail Server
Now, you can install the Postfix or libsasl2, a package that helps to manage Simple Authentication and Security Layer (SASL).
II. Create an App Password for Postfix
When you enable the two-Factor Authentication (2FA), Gmail is pre-configured to decline connections from different applications like Postfix which does not support the second step of authentication. Otherwise, this is a very important security measure that is developed to restrict any unauthorized user from accessing the account, it halts sending email through SMTP clients. Here are following steps to configure Gmail account to create the Postfix-specific password:
III. Add Gmail account Username & Password to Postfix
Username and password are saved in sasl_passwd inside the /etc/postfix/sasl/ directory. So, you will need to add your mail login credentials to this particular file and to Postfix. By doing this we will get one step closer to eventually connecting Postfix to Gmail account.
Note: Message submission can be done over 587(StartTLS) or 465(SSL) port. Whichever you choose, make sure to use the same port number throughout the procedure.
If everything is going perfect, you will receive a new file named sasl_passwd.db in this /etc/postfix/sasl/ directory.
IV. Keep Postfix Hash Database and Email Password File Safe
These files /etc/postfix/sasl/sasl_passwd and /etc/postfix/sasl/sasl_passwd.db are created in the above steps that contain your SMTP credentials in a plain text.
Restricting access to files, change all the permissions so that only a root user can read from or write to specific files. Run the following cmdlets to change an ownership to root and update file permissions for two files:
V. Configure Postfix SMTP Relay Server
In this segment, you can configure the /etc/postfix/main.cf file to utilize the Gmail’s SMTP server.
Postfix Send All Mail Via Relay Settings
User’s Problem
“I was unable to find any documentation on postfix stored emails. I don’t even know where these emails are stored and what is the file format? I need to move these emails from Postfix to Gmail. Currently, I am using Ubuntu Server 11. Can anyone suggest me a feasible solution for the same? Any help or suggestion would be highly appreciated!!”
The standard format, called “MBOX” that starts with “From” to specify the start of every message – this is the main reason why many email programs will change “From” in the body of the email message to “>From”. Also, you can configure it by using “Maildir”, in which /var/mail/[username] is a directory where each message is a certain file in that directory.
Alternate Solution to Migrate Postfix to Gmail Account
If the above-stated method does not work well, users can take help of a reliable third-party tool, i.e., MBOX to G Suite Migrator. It is designed in such a way to perform bulk conversion from MBOX to Google Apps without any data loss. The interface is simple and easy-to-use. It also helps to retain the on-disk folder hierarchy of MBOX after the conversion process. It is compatible with all latest versions of Windows operating system including 32-bit and 64 bit.
Final Words
Many users search for a reliable and efficient solution to migrate Postfix to Gmail. Therefore, in the above section, we have described a step-by-step procedure to move MBOX file to Google Apps. But, sometimes users may face various problems when performing the manual solution. Thus, we have suggested a trustworthy approach named as MBOX to G suite Migrator, which helps to export multiple .mbox files to Gmail at once without any hassle.
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