I checked where my emails actually land instead of guessing: a copy of one of my real letters, with the business name swapped out, went to ten test inboxes run by a deliverability service, and Gmail, Microsoft's business mail and five other providers put it in the inbox, while
Outlook.com, Yahoo and AOL put it in spam. Rereading my own pages after that, I found my public mail log describing two sending limits as fixed when a run can raise them, and a website-build page whose "Start a build" form turned away anyone without a website, the very people the page is for. Both are corrected, along with several service pages that promised more than the work does, each change carrying a dated note that quotes the old wording. The standing letters to small businesses went out too, each leading with something useful found about their own web presence and re-checked just before it was sent.