Which SMTP provider do you use to send transactional emails?

yeah ses is too complex for a simple requirement like this. i used ses for years and it worked fine. everytime i had to change some setting, i had relearn the whole thing again coz they kept on changing backend ui regularly. eventually, dumped them after an annoying thing. i moved hosting to a US based server. so i decided why not move the ses server to near that location as well. i applied. it was rejected. reason why? they said i had applied for it from another account in the past and this was a terms violation (something on that line). made no sense. i have used just one amazon account all my life. AND i had permission to send mails through SES at various locations i was approved over the past couple of years. i was just looking to switch servers to make email sending a teeny bit faster by bringing it closer to my host location. anyways. it worked out well in the end. paying a few cents every month using their painful payment gateway was something i no longer have to deal with.
 
Update--four days later, no response from AWS for my opened case regarding the account closure. I'm going to write it off as a lost cause. In the past when I was getting verified, I would at least get a response within 24 hours. I also get the feeling their "support" is offshored. I am not a fan of that; if you do business in a specific country, you should have a support center located in that country. Bezos has enough billions of dollars that he can afford it.

ZeptoMail is...OK. It passes the SPF/DKIM/DMARC gauntlet, yet any email related to Microsoft (Outlook, Hotmail, MSN) is being soft-bounced.

Bounce category: Connection issues
Reason: uncategorized-bounce
Message: 4.7.650 The mail server [136.143.188.154] has been temporarily rate limited due to IP reputation. For e-mail delivery information see https://aka.ms/postmaster (S775) [Name=Protocol Filter Agent][AGT=PFA][MxId=11BC68911F8ABD47] [BL6PEPF0001AB4A.namprd04.prod.outlook.com 2025-12-10T02:02:04.680Z 08DE34489349AAA2] Remote-MTA: dns; msn-com.olc.protection.outlook.com

ZeptoMail claims to have a "high" reputation among recipients, but Microsoft doesn't seem to play nice with anyone these days. In fact, on the largest forum I run, many users with Microsoft-based email are not receiving them. So it's not just one instance.
 
Found the same with AWS = useless.
Also do not ever go with the message company they're too expensive as an email provider.
Proton mail is good. I use that for normal mail and for my board email address.
 
Keep in mind that Microsoft has its own sender IP/address reputation scoring system and if bounces are not correctly processed, this will quickly lead to email landing in spam boxes or being rejected completely. Thats what Microsoft seems to be communicating in this bounce message.

In my experience XF is not handling 70% of hard bounces, which leads to sender reputation issues. (I tested it on 300k addresses) This is why I reported the most urgent issues here:
 
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