- Test what you get. Some stuff being sold as LSD might actually be another synthetic psychedelic, potentially dangerous (unlike LSD). So test: even in jurisdictions in which LSD is banned, you can easily buy tests; for LSD, this would be Erhrlich's reagent. If it tests positive, and since there's no reason to have LSD and an adulterant (unlike other drugs such as cocaine), you're safe.
Of course, this is what my friend told me.
To safely receive drugs through the mail, you do not do anything clever (like mailing them to an empty house) instead you behave in a way that gives you plausible deniability. And you do not do anything that would lead police to think you’re distributing.
Order small, personal use quantities to your name and your address and leave the package on your counter for a couple of days after it arrives. If the police show up, say you didn’t recognise the package and left it on the counter until you had time to return it to the post office.
Where you’re ordering from and to matters too. Ordering from the Netherlands into Australia almost guarantees the drugs will be found because all international mail is processed by Australia’s postal service and the Netherlands is an obvious source country. Order nationally to avoid processing.
Ultimately, it’s just like buying drugs on the street: be a nobody buying for personal use.
The biggest risk is that inevitably the seller will eventually get busted and your address will be in the seller’s records. If you’ve bought large quantities, the police will see you as a dealer and try to catch you in a sting. The best sellers do not keep records for this reason, but it’s something you won’t know until they get caught. If you buy personal use quantities, the police aren’t going to waste time on you, even if they have records of your orders.