PHP mail() does not work & How to prevent spam?

[7rdoq]

Hi buddy

I use WordPress, on contact form, after click Send button, WP warns email sent successfully but I can not receive any email

Please help me? I do not touch any PHP settings in installing sentora

And I receive so much spam email daily for email accounts, how to stop it?

Many thanks

[Ron-e]

Have you tried testing out the mail() function on plane php, so without Wordpress with plugin?
For the spam, take a look at this topic.

[7rdoq]

Yeah, just check with mail(), it return false

Then I check sendmail status with cmd 

service sendmail status

it returns

* sendmail.service
   Loaded: not-found (Reason: No such file or directory)
   Active: inactive (dead)

Then I try to send mail with cmd: 

Code:

mail -s "Test Postfix" dfsdfsdfds@gmail.com

but it returns send-mail: Cannot open mail:25

[7rdoq]

hi buddy

Are you still there?

[Ron-e]

i don't know..
Maybe someone else know more about this?

[TGates]

I had a lot of spam too. I had to make custom configs to deal with it. I also made whitelist to allow major email providers (aol, gmail, etc.) and blacklist configs to block certain .tld altogether (.top, .ru, etc.).

I used Google's help to do the customization's, unfortunately I did not write any of it down  

After the Holidays maybe I can find time to write up another tutorial for what I did.

You are not alone with this issue: Google: send-mail: cannot open mail:25 centos site:www.centos.org

[7rdoq]

Hi TGates

After find from your link, I installed sendmail with cmd

Code:

yum install sendmail sendmail-cf sendmail-doc sendmail-devel

then tried to send, but it no success

I can not find any mail log at /var/log/mail or /var/log

But when I used cmd: sendmailconfig, console alert

Code:

You have new mail in /var/spool/mail/root

Open it, I see warning

----- The following addresses had permanent fatal errors -----
<xxx@gmail.com>
    (reason: 550-5.7.1 [23.227.172.88] The IP address sending this message does not have a)

   ----- Transcript of session follows -----
... while talking to gmail-smtp-in.l.google.com.:
>>> DATA
<<< 550-5.7.1 [23.x.x.x] The IP address sending this message does not have a
<<< 550-5.7.1 PTR record setup. As a policy, Gmail does not accept messages from
<<< 550-5.7.1 IPs with missing PTR records. Please visit
<<< 550-5.7.1  https://support.google.com/mail/answer/8...entication for more
<<< 550 5.7.1 information. f78si2729769otf.316 - gsmtp
554 5.0.0 Service unavailable

[Ron-e]

check your domain with https://intodns.com/
Set a SPF record like something like: 'v=spf1 ip4:xx.xx.xx.xx ~all'

[Me.B]

1. Installing sendmail won't resolve the issue. As default setup works fine and use postfix. You just messed up your setup.

2. Check postfix logs first and ensure that port 25 is open and you are not blacklisted.

My advice check 2. before jumping into changing configs that you don't master.

M B

[7rdoq]

really thank but I can not find any mail log or postfix log at /var/log/

then I try to check postfix status, it's inactive, then I tried to restart then send email again, it's still no any log, no success

I forgot to tell I'm using CentOS 7 Minimal package with all defaults during install sentora, could this package generate these issues?