Quickbooks will use your default email client (such as Outlook) to send emails (check your sent items folder). If Quickbooks is sending email via Outlook and your Outlook settings are correct, you're good to go on your client side.
The real issue is with your email service provider. In shared hosting, some of the critical elements are set by your hosting service provider - such as requiring authentication to access the SMTP service. This shouldn't be a setting you can get to in shared hosting cPanel.
What you can do to improve email deliverability on shared hosting with cPanel is under Email Authentication, make sure DKIM and SPF are enabled, and your SPF record is set correctly (I think cPanel pretty much takes care of the details automatically nowadays).
Removing a blacklisting for an IP address can only be done by the host of the IP address. On shared hosting, if you receive a report that the sending IP has been blacklisted, you'll have to pass this on to your hosting service provider to resolve.
The real issue is with your email service provider. In shared hosting, some of the critical elements are set by your hosting service provider - such as requiring authentication to access the SMTP service. This shouldn't be a setting you can get to in shared hosting cPanel.
What you can do to improve email deliverability on shared hosting with cPanel is under Email Authentication, make sure DKIM and SPF are enabled, and your SPF record is set correctly (I think cPanel pretty much takes care of the details automatically nowadays).
Removing a blacklisting for an IP address can only be done by the host of the IP address. On shared hosting, if you receive a report that the sending IP has been blacklisted, you'll have to pass this on to your hosting service provider to resolve.
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