In vtiger to use a local smtp?

I have configured Google's smtp for vtigercrm 5.4
And there is a need to use exim as smtp
I've configured exim for this purpose
but what to change in vtiger crm I'll never know
I tried in the folder /module/Email/class.phpmailer to change
public function IsSMTP() {
 // $this->Mailer = 'smtp'; // was
 $this->Mailer = 'sendmail'; // was
 }

but the email went to spam and there is no certainty that was used by exim
June 5th 19 at 21:15
1 answer
June 5th 19 at 21:17
You can view the logs of the exim
/var/log/exim/main.log and look for on your address (where to send)
For example cat /var/log/exim/main.log | grep 'user@example.com'
You can open the e-mail source and headers to see who you sent it (server ip address)

In order not to spam you need to follow certain rules
For example:
Must have a reverse entry for the ip
It is desirable to have configured spf and dkim and dmarc even better (Thanks to him you can get a report from gmail that someone had sent a letter on behalf of your domain on their servers and why they were in quarantine)
Check your ip in various DNSBL lists (Maybe someone before you used it and his reputation is not very :-))

Read recommendations mail.ru/gmail.com/... on how not to get them in spam, there all is well painted
https://help.mail.ru/developers/mailing_rules/technical

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