Attachments sent but not received

[Dreyfuzz]

Using add_file, I have many recipients that are saying they did not receive the attached file. The attachment appears in the sent file on my gmail server. It appears that gmail accounts and certain other mail providers receive attachments fine, because when testing I did not encounter any problems. One recipient forwarded the email to another account and was able to open the attachment. Here is my code, perhaps someone can make sense of this.

require 'csv'
require 'gmail'

Gmail.new('email','password') do |gmail|
    CSV.foreach("/Users/teacher/Desktop/merge.csv") do |row|
        gmail.deliver do
            to row[5]
            subject "Report for #{row[1]} #{row[0]}"
            html_part do
                content_type 'text/html; charset=UTF-8'
                body "html body"
            end
            add_file row[4]
        end
    end
end

[myobie]

I can't reproduce this. I'm closing for now. If this happens then please open a new issue.

[Dreyfuzz]

Could I have hit Gmail's SMTP/IMAP limits?

https://support.google.com/a/answer/166852?hl=en

It doesn't seem to apply, because I sent separate messages to separate recipients.