Sendmail can't send mail and it's too slow to send. Solve it

Today's toss CentOS When Sendmail Some of the problems we encountered , If the email cannot be sent , Some problems after sending, etc , Make a unified record here , In case it's not necessary , At the same time, I hope it can help some children's shoes that encounter these problems . Each problem will have detailed operation steps , Follow the steps ;

Toss the environment ： CentOS Mail component ：Sendmail

One 、 Although the host supports mail（） function , But I can't send email ; First use the following command to check whether it is installed sendmail：

rpm –q sendmail

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The test result shows that the component is not installed , Install decisively ：

yum install sendmail

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After waiting for the installation to complete, I went to check php.ini To configure , Relevant parameters need to be modified , direct ：

vi /usr/local/php/etc/php.ini

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find sendmail_path Place of action , It is found that it is not enabled , Remove the semicolon from the front ;（ Press i Edit mode ）, Remove the semicolon , And change it to ：

sendmail_path = /usr/sbin/sendmail -t –i

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Some of this defaults to this value . Then restart sendmail：

service sendmail restart

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Two ： Sending email is too slow The above steps can send mail normally , But I found that the sending was too slow , here , Please check hosts：

cat /etc/hosts

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Results found ：

127.0.0.1               localhost.localdomain localhost

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Not in China hostname, Add it to , View the host name direct command ：hostname , The host name added here is ：testhost, Then the changed content is ：

127.0.0.1               localhost.localdomain localhost testhost

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next , restart sendmail;

After completing this step, you can also solve one sendmail and sm-client The problem of slow startup ;

3、 ... and 、 The sender of the email is ：[email protected] Issue on behalf

Method 1 ： modify hostname For personal domain Method 2 ： Disguised as a [email protected]

Execute the following command ：

/etc/mail/sendmail.mc

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Edit the file after opening , Add the following at the end ：

MASQUERADE_AS(gongzi.me)dnl FEATURE(masquerade_envelope)dnl FEATURE(masquerade_entire_domain)dnl MASQUERADE_DOMAIN(gongzi.me)dnl

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Will be one of the gongzi.me Change to your own domain name , Then save . Then execute the following command ：

 m4 /etc/mail/sendmail.mc > /etc/mail/sendmail.cf

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Then , restart sendmail service .

Four ： perform m4 /etc/mail/sendmail.mc > /etc/mail/sendmail.cf when , Report errors ：sendmail.mc:10: m4: cannot open `/usr/share/sendmail-cf/m4/cf.m4': No such file or directory, And lead to sendmail Related services cannot be started normally .

reason ： Not installed sendmail-cf solve ： Execute the following command ：

yum install sendmail-cf

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Problem solving after completion .

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