Iphone not verifying certificate

my email on iphone was working fine and when its certificate got expire and i renew it but iphone still not getting new configrations , i tested on ssl lab and certificate is valid but not getting verified on iphone, Domain name is "asrweb.in" and mail server is "mail.asrweb.in" both has valid certificate installed.

from what I look imap have right certificate but smtp(port 587) has old certificate

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how to resolve this?

what hosts mail server?

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its a normal web server not mail server

something must hosting mail otherwise you wouldn't have email

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i did not understand you, please let me know where i can check both smtp and imap configurations

let's see what binds each port., netstat -lnpt and post result here

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one program on your computer handles HTTP web traffic on port 80. it probably also handles HTTPS web traffic on port 443.
another program on your computer handles SMTP traffic.
another program on your computer handles IMAP traffic.

after updating certificates, you need every process to recheck/reload the configuration-files/certificates or restart.

no one here can tell what programs you use for this protocols, nor can we we tell you which configuration files to check.

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