Personally, I find MailGun pretty convenient to use for sending bulk emails.
Check their link out:
I worked for an Email Service Provider for four years. There is a big difference between sending an email and having it get past the spam filter and inboxed.
Just like location is key in real-estate, deliverability is the key when it comes to email marketing.
If the prospect never sees the email - does it matter how cheaply it was sent?
I'd suggest a split test sending a segment of your via multiple senders, and then measuring unique opens & click-thrus.
If it is a purchased list - you'll want to scrub it to make sure your deliverability doesn't tank overnight if you send to a spam trap.
I'd suggest using 2 services at a minimum. 1 Service to send to cold email addresses, and when someone opens or clicks on a link transfer that email to the 2nd service. You may need to replace service 1 frequently if deliverability drops.
That will keep the openers and clickers from getting nuked when if you have a spam trap on your purchased list.
The downside is that you will need to have someone build out the HTML email templates. Also, if you are not that technical, you will likely need someone to help you set up these platforms. I'd find someone on Upwork -- $15 to set up, and will definitely be more expensive for the email template.
The cheapest that I've found, almost like a light-weight Mailchimp, is EmailOctopus ( https://yourlink.to/email-octopus ) with a cost of $19pm for 10k subscribers. At this level of subscribers, you could also check out Mailchimp ($75pm), Campaign Monitor ($89pm), MailerLite ($35pm) or Get Response ($65pm). Hope this helps.
If you have a Gmail account, you can already send a lot of bulk emails quite easily using your own email address.
Tools like https://mailmeteor.com helps you send personalized emails with merge campaigns managed from a Google Sheet.
If you want to send about a thousand emails per day, that’s definitely the easiest way to start. There’s zero configuration. And it’s super cheap.