Emails going to spam folder in gmail

My experience is also that Google will not tell me. They used to have web pages detailing what they were looking for years ago but I think it eventually dawned on them that the spammers can read these too. I have made sure my forward and reverse dns entries and the EHLO domain name my mailserver uses are all correct and I have set up SPF records for my domain yet Google still put lots of emails I send to gmail.com and other Google mail service users in their spam folders. Additionally, my experience is that when I find someone abusing Google services to send or otherwise facilitate spam, Google do not provide any way that I can notify them about this abuse. Best advice is to suggest to the sender that they use a different email provider, one that doesn't put their legitimate incoming emails in the bin. Regards, Peter Coghlan.