Server Fault Stack Exchange
Server Fault Stack Exchange

Questions tagged [rfc]

A Request for Comments (RFC) is a publication of the Internet Engineering Task Force (IETF) and the Internet Society, the principal technical development and standards-setting bodies for the Internet.

A Request for Comments (RFC) is a publication of the Internet Engineering Task Force (IETF) and the Internet Society, the principal technical development and standards-setting bodies for the Internet.

107 questions
11
votes
3 answers

Does the presence of a Content-ID header in an email MIME mean that the attachment must be embedded?

Two different third-party email products we have are reacting differently to the presence of a content-id header in the MIME source of an email. This is resulting in an inconsistent user experience that we're trying to resolve. Here's an example:…
Mike B
  • 11,871
  • 42
  • 107
  • 168
9
votes
3 answers

Is quoted-printable enough to make a mail compliant with the line-length-restriction posed in RFC 2822?

In RFC 2822 (defining E-Mail) is defined, that no line SHOULD be longer than 78 chars (excluding CRLF) and MUST not longer than 998 characters. With quoted-printable longer lines will be broken into more lines, ending each with a '=' until the real…
Mnementh
  • 1,125
  • 2
  • 11
  • 18
8
votes
1 answer

Is there an official limit to nameserver indirection?

Glue records are typically unavailable if a domain and its nameserver don't share a TLD, and technically aren't required if they don't share the same second-level domain, which could lead to extra steps to resolve a domain. The resolver must first…
tylerl
  • 15,055
  • 7
  • 51
  • 72
8
votes
7 answers

Best choice of private addresses for a "device area network"

I'm building an appliance consisting of several subdevices connected by ethernet inside the appliance. The appliance will connect to the customer network. The customer network can be using private IP addresses. An address conflict with the…
proski
  • 203
  • 1
  • 7
8
votes
2 answers

Formal separation marker of syslog events?

I've been looking at RFC5424 to find the formally specified marker that will end a syslog event. Unfortunately I couldn't find it. So If I wanted to implement some small syslog server that reacts on certain messages what is the marker that ends a…
serverhorror
  • 6,478
  • 2
  • 25
  • 42
7
votes
2 answers

Why isn't net.ipv4.tcp_rfc1337 enabled by default?

The tcp_rfc1337 setting seems to have a solution for TIME-WAIT Assassination. The first problem is that old duplicate data may be accepted erroneously in new connections, leading to the sent data becoming corrupt. The second problem is that…
Nuno
  • 553
  • 2
  • 8
  • 26
7
votes
2 answers

What is the difference between 3-digit and dotted SMTP error codes?

When looking up SMTP error codes, I sometimes see "550", or "5.5.0". And sometimes the number in the dotted code is different. I found the numeric codes defined in RFC 821 and the dotted codes in RFC 3463. Is this just different notation for the…
Andrew Vit
  • 239
  • 1
  • 2
  • 10
6
votes
3 answers

SLAAC and DNS, no really - what's the deal?

So I know that there are extensions to SLAAC in the works to enable DNS discovery via RAs (RFC 6106). But what was the original intent? How did the IPv6 designers envision things working without DNS? Why did multicast DNS get dropped from…
bab
  • 443
  • 2
  • 6
  • 12
5
votes
3 answers

What to do if one doesn't want to receive email bounces?

Background—the standards RFC 5321 §4.5.5 states: All other types of messages (i.e., any message which is not required by a Standards-Track RFC to have a null reverse-path) SHOULD be sent with a valid, non-null reverse-path. For the avoidance of…
eggyal
  • 402
  • 5
  • 16
5
votes
1 answer

Replacing an MX record with a CNAME that doesn't match the hostname

Today we have 5 companies that all use Google for email services example1.com. 3w IN MX 10 mail.Google.com. example2.com. 3w IN MX 10 mail.Google.com. example3.com. 3w IN MX 10 …
makerofthings7
  • 8,911
  • 34
  • 121
  • 197
5
votes
1 answer

Is there an RFC or standard for "Envelope Journaling"?

Is there a formal standard defined for Envelope Journaling (or BCC journaling)? I'm a software developer, and want to make sure I implement the journaling consumer correctly. My model for reference is Exchange 2010 and 2003, but I don't know how…
makerofthings7
  • 8,911
  • 34
  • 121
  • 197
4
votes
1 answer

Should I reject mail to test domains?

RFC6761 states about example domains (such as example.com): Application software SHOULD NOT recognize example names as special and SHOULD use example names as they would other domain names. Currently, these example domains are set up with a…
jornane
  • 1,166
  • 1
  • 9
  • 26
4
votes
2 answers

In SMTP, how does one choose between "Accept than Bounce" vs "Bounce at the edge"?

There seems to be a variety of implementations of SMTP that either immediately reject a message, and others that do an accept, then bounce the message. Operationally, the accept-than-bounce is a little harder to use since the headers are usually…
makerofthings7
  • 8,911
  • 34
  • 121
  • 197
4
votes
1 answer

What encoding is used for non English languages in an email subject?

I'm writing a specification that essentially requires ASCII characters in an email message. I do recall that an email message can have a subject encoded in a foreign language, however I don't know what that encoding is called. I don't think the…
makerofthings7
  • 8,911
  • 34
  • 121
  • 197
4
votes
1 answer

Cisco ASA 5505, tcp window scaling (rfc1323)

I have a very odd issue with our cisco firewall, If on our osx machines we run the following to disable window scaling support: sudo sysctl -w net.inet.tcp.rfc1323=0 We see near 40% improvement in download speeds (tested using varying linux iso…
Oneiroi
  • 2,063
  • 1
  • 15
  • 28
1
2
3 4 5 6 7 8