Verizon FiOS: No SMTP Service
15/04/2018 9:30
My neighbor is letting me connect to his Verizon FiOS wireless router whilehe's away. Everything works OK, except outgoing mail.

Attempts to connect to port 25 of 'relay.verizon.net', which is the MX forverizon.net, causes the mail server to close the connection with themessage: 571 Email from 71.175.54.72 is currently blocked by Verizon Online'santi-spam system. The email sender or Email Service Provider may visithttp://www.verizon.net/whitelist and request removal of the block.

That address is within Verizon Internet Services own CIDR block: 71.160.0.0/11, so why is it blocked? It belongs to a Verizon customer.

What's going on? Does the router assign a different IP address to each useron the local network? That doesn't seem right.

Or am I all wet about that Verizon MX server? HaroldWho

Source is Usenet: comp.os.linux.networking
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Answer score: 5
15/04/2018 9:30 - Bet he would just hate if Verizon cancels his service for violation ofhis agreement by allowing you access. :( Outbound mail is to be sent to outgoing.verizon.net. To stop malwarefrom sending email, user id and password are required to send mail. :)

Source is Usenet: comp.os.linux.networking
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15/04/2018 9:30 - Because that's the name used for inbound service, which is what one wants to express with an MX record. There's no analog for expressing the outbound server in DNS. Presumably, this is because inside users have some other way of informing themselves of their outbound server(s) (ie. the documentation at which clients are pointed).

[Though it occurs to me that this would be a useful field provided by DHCP servers.] - Andrew

Source is Usenet: comp.os.linux.networking
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15/04/2018 9:30 - On Tue, 26 Feb 2008 19:45:16 +0000 (UTC), Bit Twister wrote in comp.os.linux.networking: Oops, I guess he didn't know that, nor did I.

Well, that would explain it. I wonder why an MX request with 'dig' returnsthat 'relay.verizon.net' address.

Anyway, thanks for clearing that up.

HW

Source is Usenet: comp.os.linux.networking
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Answer score: 5
15/04/2018 9:30 - On Sun, 2 Mar 2008, in the Usenet newsgroup comp.os.linux.networking, in article 2131 Dynamic Host Configuration Protocol. R. Droms. March 1997.

(Format: TXT=113738 bytes) (Obsoletes RFC1541) (Updated by RFC3396, RFC4361) (Status: DRAFT STANDARD) 2132 DHCP Options and BOOTP Vendor Extensions. S. Alexander, R. Droms.

March 1997. (Format: TXT=63670 bytes) (Obsoletes RFC1533) (Updated by RFC3442, RFC3942, RFC4361, RFC4833) (Status: DRAFT STANDARD) Try section 8.14 of RFC2132 8.14. Simple Mail Transport Protocol (SMTP) Server Option The SMTP server option specifies a list of SMTP servers available to the client. Servers SHOULD be listed in order of preference.

The code for the SMTP server option is 69. The minimum length for this option is 4 octets, and the length MUST always be a multiple of 4.

Code Len Address 1 Address 2 +-----+-----+-----+-----+-----+-----+-----+-----+-- | 69 | n | a1 | a2 | a3 | a4 | a1 | a2 | ...

+-----+-----+-----+-----+-----+-----+-----+-----+-- while section 8.15 specifies the POP3 servers. RFC2132 has some 70+parameters that can be included in DHCP, some of which are quiteuseless but seemed like a good idea at the time.

Old guy

Source is Usenet: comp.os.linux.networking
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