Email server running slow

[senkyoshi]

Hello. New guy here. I am also pretty new to linux. I am taking over the position of "server-person" here at our company and am still learning the ropes.
We are all having problems with recieving our email. It is taking a couple of hours for anybody to recieve their email from internal and external senders. What sould I look at to fix this issue.
Thank you

[jledhead]

lets start with what distro and what smtp server you are using

[senkyoshi]

It is running Red Hat Linux release 9 and ClarkConnect

[jledhead]

I actually know nothing about ClarkConnect. from their site it appears to be using postfix for the smtp. If it is postfix then your log file should be something like /var/log/mail.log (or mailinfo)

ssh to the machine and and run this
#tail -f /var/log/mail.info

this will show the transactions to your mail log in real time. CTRL-C to exit

then on a client telnet to the machine, telnet machinename smtp_port

you should get an smtp greeting. follow this Telnet - SMTP Commands (sending mail using telnet) to send a test email. use valid from and to and ones you can check. report back if you notice any strange messages in this telnet session. And then report your transaction for this email from your log file, like if its deferred or not.

if you need to narrow the tail command down do this
#tail -f /var/log/mail.log |grep email@yourdomain.com

this should only show you transactions for email@yourdomain.com

if clarkconnect doesn't use postfix then sorry for wasting your time.

[infoshirish]

Hello,
If your sites/server is using php for uploading check the file php.ini
And the File Uploads option appropriatly.