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You may try consider this:
For every major ESP use a smtp server from their trusted network.
For example, for email addreses that use Gmail (regular Gmail accounts or Google Workspace with their own domains) just use the gmail smtp (you will need a regular gmail or google workspace).
For email addresses that use Microsoft Outlook / Office servers, you should send the emails from an outlook.com smtp (you will need a regular outlook.com email account or a business plan that allows you a custom domain).
For email addresses that use Amazon servers you should send the emails from an aws smtp server (simple mail service or amazon workmail).
For other email addresses that use other email service providers, just use a major smtp provider, for example MailChannels.
However, the email has many weaknesses regarding the success of delivery and should be not used for such critical missions. You should take into consideration other methods of sending push alerts, that can be traced and confirm the delivery.
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