I have spent more than 3 hours just to resolve this issue.
I found this too: https://suitecrm.com/forum/suitecrm-7-0-discussion/16507-mail-stopped-working-error-smtp-connect-failed#55682
but from where exactly how do I check this box? I could not find the location. I am getting this
Mon Mar 18 04:35:56 2019 [537329][1][FATAL] SugarPHPMailer encountered an error: SMTP Error: The following recipients failed: xxxx@gmail.com: "Your IP: 198.54.114.38 : Your domain gmail.com is not allowed in header
From"
Mon Mar 18 04:37:31 2019 [545839][1][FATAL] SugarPHPMailer encountered an error: SMTP Error: The following recipients failed: xxxx@gmail.com: "Your IP: 198.54.114.38 : Your domain gmail.com is not allowed in header
From"
Mon Mar 18 04:37:31 2019 [545839][1][FATAL] SugarPHPMailer encountered an error: SMTP Error: The following recipients failed: xxxx@gmail.com: "Your IP: 198.54.114.38 : Your domain gmail.com is not allowed in header
From"
Mon Mar 18 04:41:22 2019 [574137][1][SECURITY] Email Error: Not authorized to use Outbound Account "system"
Mon Mar 18 04:41:22 2019 [574137][1][SECURITY] User Mubashar Ali attempted to send an email using incorrect email account settings in which they do not have access to.
Mon Mar 18 07:54:29 2019 [780220][1][SECURITY] Email Error: Not authorized to use Outbound Account "system"
Mon Mar 18 07:54:29 2019 [780220][1][SECURITY] User Mubashar Ali attempted to send an email using incorrect email account settings in which they do not have access to.
Mon Mar 18 08:03:11 2019 [856375][1][FATAL] SugarBean::populateDefaultValues $field_defs should be an array