DSM 6.2.4-25556-update 7 e-mail

Since a week my NVR1218 with DSM 6.2.4-25556-update 7 does not sent e-mail messages anymore through my Google account. I receive error message I am using a less secure app. Has someone the same problem and a solution? Thanks in advance.

It could be a firewall issue (I had this when installing an email client [Thunderbird] on a Linux desktop).
This reference might help point you in the right direction to make a start on troubleshooting your issue Gmail firewall settings - Google Workspace Admin Help
I resolved my issue by temporality turning off Firewall whilst installing the email client then turning it back on again after the installation.

Thanks for your reply and advice!
By using Method 1 ( instead Method 2 which I used before) as mentioned within the “ How do I use Gmail SMPT server to send emails for DSM” the problem was solved.

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