Resolved Plesk doesn't send Emails

[xt.Tobi]

Hello,

I just set up Plesk Onyx and now I have the Problem that Plesk canot send Emails. There is a error in the Postfix log, but I don't understand it. Please help me.

May 2 19:39:57 tobiserver postfix/smtp[1733]: B01DE6061E: host 10minutemail.co.uk[85.128.253.245] said: 450 4.7.1 Client host rejected: cannot find your reverse hostname, [87.106.157.168] (in reply to RCPT TO command)
May 2 19:39:57 tobiserver postfix/smtp[1733]: connect to 10minutemail.co.uk[2a01:6100::5580:fdf5]:25: Network is unreachable
May 2 19:39:57 tobiserver postfix/smtp[1733]: B01DE6061E: to=<d2f52371@10minutemail.co.uk>, relay=none, delay=428433, delays=428433/0.01/0.46/0, dsn=4.4.1, status=deferred (connect to 10minutemail.co.uk[2a01:6100::5580:fdf5]:25: Network is unreachable)

~Tobias

 

[AYamshanov]

Hi,

1) Postfix tried to send an email via IPv4 but remote server rejects connection because your server does not have a reverse hostname. You need check PTR record for IP-address of your server.

- nslookup www.domain.com (you should get ip-address)
- nslookup ip.ad.dr.ess (you should get domainname)

Expand/Collapse Block: 10minutemail.co.uk

> 10minutemail.co.uk
Server: 8.8.8.8
Address: 8.8.8.8#53

Non-authoritative answer:
Name: 10minutemail.co.uk
Address: 85.128.253.245
> 85.128.253.245
Server: 8.8.8.8
Address: 8.8.8.8#53

Non-authoritative answer:
245.253.128.85.in-addr.arpa name = aos245-rev.netart.pl.

Expand/Collapse Block: 87.106.157.168

> 87.106.157.168
Server: 8.8.8.8
Address: 8.8.8.8#53

** server can't find 168.157.106.87.in-addr.arpa: NXDOMAIN

2) Postfix tried to send an email via IPv6 but remote server is inaccessible via IPv6. As an example, configured IPv6-address on server with Plesk is not routable.

 

[xt.Tobi]

Ok at first thank you.

I don't know DNS very well. So can you give me short instructions how and where to add a PTR-Record.
These are the exsisting DNS Settings.

There is also an Firewall running by my Provider may the Problem is caused by the Firewall

Thank you
Tobi

(Sorry for my English...I'm German)

 

[AYamshanov]

Hi xt.Tobi,

Usually, this action can do only service provider (owner of network IP-range). In some cases, this is possible via service provider web-interface. At page (as an example of WHOIS -service) WHOIS IP Lookup Tool | UltraTools you can see that the IP-address is part of /24-network (inetnum). An owner of the network is 1&1 (descr).

So, I think this can helps you: Configure a Reverse Map - 1&1 Help Center

 

[xt.Tobi]

Hi AYamshanov,

thank you now I understood the Problem and now sending emails is working

Tobi