[Gambas-user] Spam after subscribing

[Christof Thalhofer]

Hi,

Am 13.07.19 um 23:09 schrieb Mayost Sharon:

> NOQUEUE: reject: RCPT from unknown [83.223.95.100]: 450 4.7.1 Client 
> host rejected: can not find your hostname, [83.223.95.100]; from = 
> <user-bounces at lists.gambas-basic.org> to = <sharon at 455.co.il> proto
> = ESMTP helo = <bmailout1.hostsharing.net>

Your server seems not to look at the SPF record in DNS which offers
bmailout(x).hostsharing.net as valid senders for the domain
lists.gambas-basic.org:

> christof at tof-x230 ~ » dig -t TXT lists.gambas-basic.org
> 
> ; <<>> DiG 9.11.3-1ubuntu1.8-Ubuntu <<>> -t TXT 
> lists.gambas-basic.org ;; global options: +cmd ;; Got answer: ;; 
> ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 23486 ;; flags: qr 
> rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1
> 
> ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 4096 ;; 
> QUESTION SECTION: ;lists.gambas-basic.org.		IN	TXT
> 
> ;; ANSWER SECTION: lists.gambas-basic.org.	21071	IN	TXT	"v=spf1 a mx 
> a:bmailout1.hostsharing.net a:bmailout2.hostsharing.net
> a:bmailout3.hostsharing.net ~all" lists.gambas-basic.org.	21071	IN
> TXT 
> "google-site-verification=cLeDOKKbzAGTzV7kSq7yD1_O_00ElsFfT2Cv7auKp3U"

If it is your own server you could install one of the incarnations of
the SPF framework:

> christof at xserver ⚡ $ apt-cache search postfix | grep spf
> spfquery - Abfragen das SPF (Sender Policy Framework), um Versender von E-Mails zu validieren
> libmail-spf-xs-perl - library for validating mail senders with SPF - Perl bindings
> libspf2-2 - library for validating mail senders with SPF
> libspf2-dev - Header and development libraries for libspf2
> postfix-policyd-spf-perl - Simple Postfix policy server for RFC 4408/7208 SPF checking
> spf-milter-python - RFC 4408 compliant SPF Milter for Sendmail and Postfix
> postfix-policyd-spf-python - Postfix policy server for SPF checking
> tumgreyspf - external policy checker for the postfix mail server


Alles Gute

Christof Thalhofer

-- 
Dies ist keine Signatur

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