I have a client that wants to send an email blast from outlook contact list a couple of times a week. He has about 1000 recipients in his contact list.
1)how / where do I configure this in VM/postfix? I realize that if I up the limit it will be global for all domains, but that might be OK at this point.
2)what is mailman? can the user use his outlook list with out having to duplicate it in mailman? I cant seem to get the default "mailman" list to be made anyway…
Any advice/direction/strategies/policy appreciated…
But would also like to know how to up the postfix limit too.
What limitation are you referring to? Are you seeing Postfix limit how many outbound messages can go out?
In theory, the only thing Postfix would limit by default would be the message size – if you’re seeing additional limitations, you might want to poke around in /etc/postfix/main.cf to see if some message quantity limits were later added in.
Mailman is mailing list manager – your users could certainly use that for managing the list of people they’re sending the email blast to. The advantage there is that it’ll handle automatically unsubscribing people who no longer want to participate in the email blast.
Perhaps a better option is the phplist application, which is available in the Install Scripts.
In addition to being able to automatically unsubscribe people, it also has the ability to rate limit how many users it sends to at once, you don’t have to handle setting that up in Postfix.
The thing to be careful with is that folks have to be careful how they go about sending out mass emails, or else they could get your entire IP address listed in one of several black hold lists. I ended up setting up a separate server purely for the folks who were sending out emails. I still get on their case about following all the anti-spam rules, but if they goof up, it doesn’t affect all the hosting customers.
-Eric
The feedback i got from the client when he tried his first email blast on my server was that only about 300 out of 900 email went through. I think the rest were returned to him.
Also he had an experience on the last server that they would take a long time to send, like they got released over time, and he didnt like that.
in the postfix module there is a button called “delivery rates” which gives you some options. This is server wide.
I have “Max number of recipients per message delivery” set to 50 but I’d rather put a limit on hourly delivery for the server…
As for phplist (what I use) it is very good but a bit hard to configure properly.
I have used phplist. I think there is a vulnerability advisory on it. Probably fixed by now, But I couldnt continue using it because of that at the time.
I can think of a way to test, but it would be very complicated and time-consuming to setup. Basically, you’d setup a BIND server that authoritative for all of the domains in your list, and has phone MX records pointing to another mail server under your control that accepts all the mail for all of those domains. It’d be possible to script creation of the mail boxes and BIND zones, but the actual configuration process would still be very time-consuming. I’d estimate a full day or two, if you know what you’re doing with BIND and Postfix, and dramatically more time if you don’t.
You could try sending in small batches the first time, while watching the log for signs of trouble. That doesn’t really prove that the big batch will work, but it does prove that sending to all of the recipients works without trouble.
Note also that there are a few gotchas to sending out to large batches of addresses:
Sending to many addresses in the same domain in a short period of time or in the same connection looks spammy. The latter is an efficiency feature of the SMTP protocol, but since it has been abused by spammers, it is often no longer useful to legitimate mailers. So, it may be necessary to send in smaller batches, anyway, in order to avoid triggering this problem.
Make sure your DNS is configured correctly for your mail server (meaning the name it uses resolves to the IP address it is connecting on), and that the DNS server that is authoritative for the From: address domain has an accurate SPF record.
Check to be sure your mail server is not already on any RBLs. If it is, fix the problem, and request de-listing.
I’ve solved the first problem in the past (when we migrated to a new CMS and needed to notify everyone of the username and password changes) by writing a simple Perl script that queried our user database for the addresses, and then sent one at a time every 2 seconds until they were all sent out. It also sorted on username rather than the domain name being sent to. This avoided any single mail server seeing messages from us in a big batch. It probably also helped that every message was customized to include the users name, their new password and other details about their specific account.
Hi, This is something that I will need to be doing soon
as I will want to send my subscribers a newsletter.
I intend to have my php script simply work through the mysql client table and send each client the same email with a separate mail()
command in the while loop. I will NOT be using cc or bcc.
If I have 800 clients is this going to cause some kind of
server overload ?
Is this the best approach ?
Should I pause a second or two between a batch of
say ten, to avoid problems ?
You said:
2. Make sure your DNS is configured correctly for your mail server (meaning the name it uses resolves to the IP address it is connecting on), and that the DNS server that is authoritative for the From: address domain has an accurate SPF record.
Can I see ( and check ) that these are OK by looking in the log
after I have sent out a test to my own email account ?
How much a load 800 emails will cause is going to depend on your hardware – that’s not too huge an amount. Some systems can do that without blinking, and for others, it’s a bit tougher.
You could certainly build a few pauses into your script. You might also consider running it outside of business hours just in case.
And then, if you see too high a load, you could just increase the pause lengths for next time
Is it the best approach?
I mean, if it solves your problem in a way that works for you, than sure
Personally, I might prefer a tool like PHPList since it already solves a lot of the rate limiting problems for you, and also makes it simple for users to opt-out if they no longer want to participate.
Regarding DNS – the thing to do would be to use an external server to perform two DNS lookups – one on the Internet facing IP address of your server to get the hostname… and then, another on that hostname to make sure it solves back to your IP address. Those two should match exactly.
You can do all that from the Linux command line (again, you’ll want to do it from a server other than your own), or there’s also various websites out there that can test it for you. Ronald has mentioned a few of them in the past, though at the moment I forget what they are
-Eric
Max number of parallel deliveries to the same destination: 20?
Max number of recipients per message delivery : 1000?
Initial concurrency level for delivery to the same destination: 5?
Does any of that look good for enabling 1000 emails to quickly be emailed? Or is there more somewhere else?
You said the 800 may cause a problem depending on my server]
I try not to say much that’s “definitive” – usually
800 messages really isn’t all that much, in the grand scheme of things. I just like to error on the side of caution. If you’re the one building the script that sends all that stuff out, I’d certainly add in a few pauses here and there since that’d be easy to do.
After you send it all out once or twice, and you find it’s not a large load, it’d be trivial to reduce or remove the pauses.
-Eric
Well, while I’m not familiar with phpmailer specifically, what I’d do is just go ahead and download it, copy it onto your server, then read the instructions for setting it up.
They’d probably have an INSTALL or README file that will help you get it going.
From there, you can test it out and see if it does the trick for you.
-Eric
1 Max number of parallel deliveries to the same destination: 20?
2 Max number of recipients per message delivery : 1000?
3 Initial concurrency level for delivery to the same destination: 5?
what i have is
1 50
2 300
3 10
My first mailing I did was sending out 4500 emails in one batch (those got out in 25 minutes), I got more than one complaint back, so I got more careful since. Per batch I send 300 max, takes longer to send though.
Now should I use the command shell to download this
wget is really handy for this. Log in and type: wget http://complete/url/ot/file.zip thus: [code:1]wget http://sourceforge.net/project/downloading.php?group_id=26031&filename=PHPMailer_v5.0.0.tar.gz&a=93017632[/code:1]
I have asked about this subject on some other forums
and many have suggested using phpmailer.
( I notice that it is not on the Install scripts
page )
PHPMailer is a library for sending mail with PHP scripts. It does not provide a user interface, as far as I know. Though it looks like the developers do provide some UI tools to make use of the PHPMailer library.
It pretty much doesn’t make sense to provide an Install Script for this, as it usually needs to be placed in a specific location within your applications source directory. For example, our new Drupal website has it installed within the messaging module.
Now should I use the command shell to download this
or is there a better section within WebMin
or VirtualMin to do this ?
There is an Upload and Download module in Webmin for this purpose, which can download from a URL on the web. Keep in mind, however, that Sourceforge download URLs are tricky. You have to click, then cancel the download to your local machine, and look for the "Direct Link" or whatever on the page to get an actual download link that will work with wget or the file downloader in Webmin.
Once downloaded, though, you’re still going to have to interact with it. Untar it, and such. For which a real shell is the way to go…PuTTY, as we discussed in another thread, will work fine.
