MT4 email alerts on VPS not working

Hi,
Can anyone help to understand why my VPS's not sending emails with indicator alert placed onto MT4? I got 2 different VPS providers and both of them refuse to send email, properly configured in Option>Email settings. I got the same email SMTP settings on my laptop and it works fine. However MT4 loaded on VPS with exactly the same settings failing to send test emails. I have contacted VPS providers and they confirmed all ports for SMTP are open.
Does anyone could help with this issue?
Thanks

Hi have you figured this out? What type of email do you have? gmail/yahoo/gmx? I cant get my MT4 emails to work at all on any email service. help!

I used to use gmail. The problem is in gmail as per security. I get an alert of attempted log in from gmail. Gmail will tell you what to do as per the security setting.