I have problem with email provider.
We are using provider email server for email accounts.
Soon they installed "something" and instruct users to check box in email clients my server requires authentication.
After this email is working normal, but sometimes when we leave office users cannot send emails, sometimes they can.
What is this check box actually for? Is it use some other port then 25 for sending emails? what could be the problem?
How can I test the network where I am in this momement is this network ready for this kind of service?
Thanks in advance!