Re: check_recipient_a_access DISCARD leads to 451 4.3.5 Server configuration error

2017-11-15 Thread Matus UHLAR - fantomas
On 14.11.17 20:02, liquid cooled wrote: The problem is as follows: A spammer is using an ip address which hast thousands of domains registered, the apammer uses a botnet to send from his domains but from many different source ips. don't you want to use check_sender_a_access instead? last time

Re: Is it compulsory for an outgoing smtp server to have FQDN.

2017-11-15 Thread @lbutlr
On 15 Nov 2017, at 08:48, P.V.Anthony wrote: > From the helo, I can see DD1HMALT02.hmail.sg. But this domain does not > resolve, as you can see bellow. So comes my question, is it complulsory for > an outgoing smtp server to have a fully qualified domain name. With

Re: Is it compulsory for an outgoing smtp server to have FQDN.

2017-11-15 Thread Noel Jones
On 11/15/2017 9:48 AM, P.V.Anthony wrote: > Hi, > > My postfix server was rejecting emails from the following server. I > think it is because I am using "reject_unknown_helo_hostname". > > -- start -- > Nov 15 13:20:13 mail postfix/smtpd[14663]: NOQUEUE: reject:

Re: Is it compulsory for an outgoing smtp server to have FQDN.

2017-11-15 Thread Wietse Venema
P.V.Anthony: > If it is not complusory then my setting was too strong and I really > should remove "reject_unknown_helo_hostname". Using this feature wil reject non-spam email, because there are still too many mis-configured mail servers. Wietse

Is it compulsory for an outgoing smtp server to have FQDN.

2017-11-15 Thread P.V.Anthony
Hi, My postfix server was rejecting emails from the following server. I think it is because I am using "reject_unknown_helo_hostname". -- start -- Nov 15 13:20:13 mail postfix/smtpd[14663]: NOQUEUE: reject: RCPT from unknown[103.230.232.100]: 450 4.7.1 : Helo

RE: Header-Name: capitalization

2017-11-15 Thread Michael Fox
> https://tools.ietf.org/html/rfc5322#section-1.2.2 > Ah! Thanks Viktor. Michael