In my server have multiple ips , if i try to send mail via relayhost all ips taken same relay only, but i need first ips taken relay other ips wont allow relay , how can i do that , any one know the answer help me

Read the "Question Guidelines" link in my posting signature. You provide no details about your system, tell us what mail system you're using on what version/distro of Linux. We can't guess. And please do basic research before posting.

There are abundant how-to guides you can find with a brief Google search; either "postfix single ip address outgoing" or "sendmail single ip address outgoing".

os: centos, am using postfix-2.10.1 application

am trying to configure relay on my server this is my configiration file entry
vim /etc/postfix/main.cf

inet_interfaces=all
relayhost = [smtp.example.com]:25
smtp_sasl_auth_enable = yes
smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
smtp_sasl_security_options = noanonymous
smtp_tls_CApath = /etc/ssl/certs
smtp_use_tls = yes

after am trying to send mail first ip via this relay its properly working . and am trying second ip to snd mail. this ip also taken same relay.. but my need first ip wants to take relay. not a second ip..

Use CODE tags when posting configs/code, please. And your question is now vague...are you saying you want to use your CentOS system AS a relay host, or you want it to send all its mail to ANOTHER relay host, via one address???

If it's the latter, you can again use the search term provided for ample how-to guides on how to set this up, such as:
https://www.faqforge.com/linux/send-...ss-in-postfix/

centos is not relay host here, i mention centos is my server os . am buy a relay from ISP. now my doubt is

for example ) i have a 2 IPS 2 relays . if i want to send mail via first ip . it need to be take first relay
if i want to send mail via second ip . it needs to take second relay.

Ok; again, read the previous posts that **TELL YOU** what to do.

i have tried this all the ways but i couldn't reach my required output.

i have a two ips like 172.25.0.1,172.25.0.2 and i have a only one relayhost [smtp.example.com]. now i try to send mail via ip

172.25.0.1 its taken [smtp.example.com] relay . its working fine . no issues on that. After i try to send mail via ip

172.25.0.2 its also taken same relay only. but i need to configure relay for only one ip .

if i send mail via second ip its need to through error .

Right; again, you either have not read or understood what you were told. You were given search terms, and handed a link that explains, in detail, what to do, what directives to use, and in what config files.

Re-stating your problem (again), does nothing to solve it. Either read and follow the instructions, or there isn't much we can help you with, and you should hire someone to do this job for you.

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