Are PTR Records Important?

erfmuffin asks: "I work for a medium-sized regional ISP. Recently we configured our email gateway to refuse connections to IP addresses that do not resolve (ie no reverse DNS). I am amazed at how many legitimate domains use mail servers with no PTR record! At the same time, we have avoided a great deal of junk mail in one swoop. Wouldn't it be better for mankind if all mail servers refused mail from non-resolvable IPs? Should all legitimate mail servers have valid PTR records or has the world become too lazy to make email delivery, easier?"

Comments

u r ghey

[Anonymous Coward]

Dear:

[ ] Clueless n00b
[ ] Lamer
[ ] Ricer
[ ] Kid with no clue
[ ] Flamebait
[ ] Jackass
[ ] Lazy person
[ ] Me too'er
[ ] Spammer
[ ] Idiot
[ ] Asterik-laden adjective
[ ] Pointless Thread Starter

You Are Being Flamed Because:

[ ] You continued a long, stupid thread
[ ] You said "me too" to something or "Send ______"
[ ] You asked for w@rez
[ ] You don't know what you're talking about
[ ] You suck
[ ] You posted one of the reposts from hell.
[ ] Your post title has nothing to do with the content
[ ] You complained about something you got for free/low cost
[ ] You are not the grammer police
[ ] You hate the U.S. or its policies yet will not leave
[ ] You started a flamewar thread
[ ] You are b!tching about something you have no right to b!tch about
[ ] You asked for medical help on a computer forum
[ ] You asked an incredibly stupid question
[ ] You like ricers
[ ] You are a ricer
[ ] You asked how to mod a honda
[ ] Your sig/alias sucks
[ ] You did not listen to a smarter member or ignored advice
[ ] You need use the damn search button
[ ] You said any version of "repost" This is allowed sometimes but not this time
[ ] You posted something totally uninteresting
[ ] You posted a topic/message all written in CAPS
[ ] You posted spam
[ ] Your stupidity is astounding
[ ] You used the words 'suxors' and/or 'roxors'
[ ] You posted "FIRST POST!"
[ ] You are quitting the website for good...again
[ ] You complained about the Mods

To Repent, You Must:
[ ] Give up your AOL/Euronet/MSN/Planet Internet account
[ ] Bust up your modem with a hammer and eat it
[ ] Jump into a bathtub while holding your monitor
[ ] Actually post something relevant
[ ] Listen to Moonbeam for 3 hours
[ ] Become friends with Red Dawn
[ ] Pry the Caps Lock and Shift keys from your keyboard
[ ] Read the damned FAQ
[ ] Cut off both your hands with your own hands
[ ] Post some damn pics
[ ] Go hug your parents right now
[ ] Remove the Slashdot forum from your list
[ ] Read the manual / instructions
[ ] Remove your genitalia so you do not breed
[ ] Repenting is not possible, you are banned.
[ ] Use the damned search function
[ ] Post in the right damned forum
[ ] Put your car into a crusher
[ ] Apologize to everybody on this website
[ ] Actually leave the website for good