![]() If you have an on-premises non-Exchange server, application or device that relays email through your Office 365 tenant either by SMTP AUTH client submission or by using a certificate based inbound connector, make sure these servers or devices or applications support TLS 1. 0 This tutorial will focus on setting up a Postfix SMTP server to use Dovecot SASL for user authentication. Folks, Apologies for the delay in getting this addressed. Failed login attempts from strange locations/IPs in the logs would indicate ongoing brute force and spray attacks against the Office 365 tenant. com and not a regional Exchange Online Server server like smtp-apacnorth. However, we can use it to verify if we can connect successfully to Office 365. com) NOTE: When using Outlook365, if the "From Address" and "Auth Username" do not match, there is a potential need to configure "Send As" privileges for your mail server. ![]() Environments in which the self-signed SSL certificate created by the installer is used and where this certificate has initially been creating during the installation of MailStore Server 5 or older. 5 certificate validation failure" was logged on the server. Certificate verification failed for smtp office365 com We chose the garden offering.
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