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When did sending transaction based emails become Email marketing. LOL
I'm not an expert on this, but have been doing a lot research on this and practicing alot lately.
Basics of this -- Stick to 300-500 mails for 2-3 days, then throttle up in 500+ increments.
Importantly, you will need to monitor your hard and soft bounces, setup Feedback loops and register your mailserver with Google/yahoo/MS through their enrollment form.
Keep your List clean, bad mail IDs and >10% bounce ratio will get you bad reputation and eventually you'll be blacklisted.
Here's an interesting piece from a former gmail engineer, for generally avoiding the hallmarks of spam. https://moderncrypto.org/mail-archive/messaging/2014/000780.html
Only problem with this is that Microsoft requires you to own the IP block and prove it, unless they've changed that recently. AOL claims to require the same but they will work with forward confirmed rDNS instead. Yahoo does it by sending domain. Google just doesn't do it.
SWIP?
When someone talks about throttling up the email qty it doesn't smell good
If it looks like spam. Smells like spam. It probably is spam. Anyone want to vote on the kind of email this server will send? I don't think I want any
Should work. Also works if your provider (assuming they own their IPs) will tell them the IPs are yours alone, which I personally wouldn't do unless you're certain they are a long term client.
Microsoft uses the domain name as well as the IP address, so warming up an IP seems pretty fruitless.
Google does the same - Both will however ban you for sending X in Y time unless you had Z in the last period A.
I'm not gonna do that. In most cases what it does is. Google will ban your IP
My provider doesn't support swip yet.
sigh
Can you send me those links.
In that case, you've made a terrible decision to try to send them yourself. Unless you are very experienced mail administrator (which is clearly not the case), use one of the many established services. Doing otherwise is completely foolish.
Yeah. Already signed up with a 3rd party provider.
The rise of the email delivery services is because it's just too time consuming to DIY
it's too too much
Well played. My hat is off you to for understanding what opportunity cost is - most people don't have a clue.
I use a toaster oven or a microwave
You're not crazy at all. All the major email delivery services advise warming up new IPs (and generally do so automatically).
https://sendgrid.com/docs/User_Guide/Setting_Up_Your_Server/warming_up.html
https://mandrill.zendesk.com/hc/en-us/articles/205582287-How-do-I-warm-up-my-dedicated-IP-address-
https://documentation.mailgun.com/best_practices.html#ip-addresses-and-sending-volume
Warming up is rather pointless if you have mails, that have to be delivered and if the volume is low. ESPs have lots of millions of mails a month per ip and they can send millions of mails to the best subscribers of their clients (never bounced, not even soft-bounced). Also they often use SPF, DKIM, DMARC and feedback loops (blog.returnpath.com)
In europe ESPs can also be member of https://certified-senders.eu/, so they promise to stick to very specific rules. You already said that, but with your volume I would stick to ESPs, because you can't do any better. They have dedicated people for deliverability issues and they can do things, that you can't do as a small business.
@ricardo said:
Very good reading, I've seen a demo of the kind of sybil attack he's talking about and he's right - it's the weakest point in the chain.
Thread is TL;DR.
My TL;DR: new IP + DKIM + SPF => mail does not go to spam anywhere
@deadbeef, it'd definitely be in the 'war chest' of anyone doing serious volume of email it seems. A couple of thousand accounts on each of the major providers just to oil the cogs.
Toaster oven gives clearer signals.

Also, perhaps listing your abuse@ address with the Network Abuse Clearing House is appropriate here.
It's about putting an IP in a microwave to warm it up.