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webmail bounced back if the recipient is a gmail account

I have a Wordpress website hosted in AWS Lightsail/Plesk.

I found all the outgoing webmail are bounced back if the recipient is a gmail account.

I consulted with the AWS support and they replied saying that:

"I also looked into the error you faced while sending the emails to Gmail. You faced the error '550-5.7.26', which on Google's support website lists the reason for denying your request as unauthenticated, i.e. it didn't find an SSL certificate to be authorised to send emails to Gmail. You need to configure your email service with an SSL certificate with v1.2 or higher to bypass this error"

However, another hosting company said:

"We believe it is not related to the SSL-Key. Maybe you can check with your server service provider to see if their email server support TLS1.2, if yes, you may ask them to enable it. If not, you may consider to upgrade your server OS as CenttOS 5 not support TLS1.2 feature. "

So I am looking for someone who is really experienced and have absolute confidence in this field to tackle the problem. Anyone who had experience in fixing exactly the same problem is most welcome.

Skills: Amazon Web Services, DNS, Linux, Web Hosting, WordPress

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About the Employer:
( 0 reviews ) Kowloon, Hong Kong

Project ID: #24601085

Awarded to:

vinnie6669

I am a Linux admin have 10 years of experience in this field. I worked in webhosting industry and manage datacenter from remote. I have done this many times we need to check all rDNS hostname spf dkim etc to fix this. More

$233 HKD in 1 day
(59 Reviews)
5.2

5 freelancers are bidding on average $205 for this job

kuldeepvk

Hi, I have experience in aws server and will check also why webmail is not working.I have more than 10 years of experience in this. Thank you

$240 HKD in 1 day
(389 Reviews)
7.0
infihost

Hi, I will audit complete configuration of webmail and will fix the issue of bounce back. I do have more than 11 years of expertise in web hosting, server setup, etc Please discuss to start. Thank you.

$240 HKD in 1 day
(191 Reviews)
6.0
ranumehta2017

***AWS EXPERT*** More

$160 HKD in 7 days
(35 Reviews)
4.8
NitinSheoran

Hello, I'll check and resolve your issue. Please inbox me for further communication. Thank you.........

$150 HKD in 1 day
(50 Reviews)
4.6