Question Unable to send mail (postfix)

[Manuxy]

Server operating system version

Debian 11

Plesk version and microupdate number

Plesk Obsidian Version 18.0.53

Hello,
I receive emails, but the sending is stuck in the queue.

Log:
Jul 25 08:30:04 D1B7468 postfix/smtpd[176467]: connect from localhost[127.0.0.1]
Jul 25 08:30:04 D1B7468 postfix/smtpd[176467]: TLS SNI localhost from localhost[127.0.0.1] not matched, using default chain
Jul 25 08:30:04 D1B7468 postfix/smtpd[176467]: 4680C24C1843: client=localhost[127.0.0.1], sasl_method=PLAIN, sasl_username=xxxxx@xxx.xx
Jul 25 08:30:04 D1B7468 postfix/cleanup[176472]: 4680C24C1843: message-id=<6a7660d0deb77a0cf00faec7244ad2f3@xxx.xx>
Jul 25 08:30:04 D1B7468 postfix/qmgr[145626]: 4680C24C1843: from=<xxxxx@xxx.xx>, size=549, nrcpt=1 (queue active)
Jul 25 08:30:04 D1B7468 postfix/smtpd[176467]: disconnect from localhost[127.0.0.1] ehlo=1 auth=1 mail=1 rcpt=1 data=1 quit=1 commands=6
Jul 25 08:30:34 D1B7468 postfix/smtp[176480]: connect to mx00.1and1.fr[212.227.15.41]:25: Connection timed out

telnet test:
RCPT TO:<xxxxx@xxx.xx>
554 5.7.1 <xxxxx@xxx.xx>: Relay access denied

Anyone have an idea?
THANKS